provide compa options

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

api/api.go

@@ -5,7 +5,8 @@ import (
 	"regexp"
 	"strings"
 
-	"github.com/unistack-org/micro/v3/registry"
+	"github.com/unistack-org/micro/v3/metadata"
+	"github.com/unistack-org/micro/v3/register"
 	"github.com/unistack-org/micro/v3/server"
 )
 
@@ -55,7 +56,7 @@ type Service struct {
 	// The endpoint for this service
 	Endpoint *Endpoint
 	// Versions of this service
-	Services []*registry.Service
+	Services []*register.Service
 }
 
 func strip(s string) string {
@@ -102,19 +103,23 @@ func Encode(e *Endpoint) map[string]string {
 }
 
 // Decode decodes endpoint metadata into an endpoint
-func Decode(e map[string]string) *Endpoint {
+func Decode(e metadata.Metadata) *Endpoint {
 	if e == nil {
 		return nil
 	}
 
-	return &Endpoint{
-		Name:        e["endpoint"],
-		Description: e["description"],
-		Method:      slice(e["method"]),
-		Path:        slice(e["path"]),
-		Host:        slice(e["host"]),
-		Handler:     e["handler"],
-	}
+	ep := &Endpoint{}
+	ep.Name, _ = e.Get("endpoint")
+	ep.Description, _ = e.Get("description")
+	epmethod, _ := e.Get("method")
+	ep.Method = []string{epmethod}
+	eppath, _ := e.Get("path")
+	ep.Path = []string{eppath}
+	ephost, _ := e.Get("host")
+	ep.Host = []string{ephost}
+	ep.Handler, _ = e.Get("handler")
+
+	return ep
 }
 
 // Validate validates an endpoint to guarantee it won't blow up when being served

api/handler/http/http.go

@@ -11,7 +11,7 @@ import (
 
 	"github.com/unistack-org/micro/v3/api"
 	"github.com/unistack-org/micro/v3/api/handler"
-	"github.com/unistack-org/micro/v3/registry"
+	"github.com/unistack-org/micro/v3/register"
 )
 
 const (
@@ -70,7 +70,7 @@ func (h *httpHandler) getService(r *http.Request) (string, error) {
 	}
 
 	// get the nodes for this service
-	nodes := make([]*registry.Node, 0, len(service.Services))
+	nodes := make([]*register.Node, 0, len(service.Services))
 	for _, srv := range service.Services {
 		nodes = append(nodes, srv.Nodes...)
 	}

api/handler/http/http_test.go

@@ -12,13 +12,13 @@ import (
 	"github.com/unistack-org/micro/v3/api/resolver"
 	"github.com/unistack-org/micro/v3/api/resolver/vpath"
 	"github.com/unistack-org/micro/v3/api/router"
-	regRouter "github.com/unistack-org/micro/v3/api/router/registry"
-	"github.com/unistack-org/micro/v3/registry"
-	"github.com/unistack-org/micro/v3/registry/memory"
+	regRouter "github.com/unistack-org/micro/v3/api/router/register"
+	"github.com/unistack-org/micro/v3/register"
+	"github.com/unistack-org/micro/v3/register/memory"
 )
 
 func testHttp(t *testing.T, path, service, ns string) {
-	r := memory.NewRegistry()
+	r := memory.NewRegister()
 
 	l, err := net.Listen("tcp", "127.0.0.1:0")
 	if err != nil {
@@ -26,9 +26,9 @@ func testHttp(t *testing.T, path, service, ns string) {
 	}
 	defer l.Close()
 
-	s := &registry.Service{
+	s := &register.Service{
 		Name: service,
-		Nodes: []*registry.Node{
+		Nodes: []*register.Node{
 			{
 				Id:      service + "-1",
 				Address: l.Addr().String(),
@@ -58,7 +58,7 @@ func testHttp(t *testing.T, path, service, ns string) {
 	// initialise the handler
 	rt := regRouter.NewRouter(
 		router.WithHandler("http"),
-		router.WithRegistry(r),
+		router.WithRegister(r),
 		router.WithResolver(vpath.NewResolver(
 			resolver.WithServicePrefix(ns),
 		)),

api/handler/rpc/rpc.go

@@ -1,495 +0,0 @@
-// Package rpc is a go-micro rpc handler.
-package rpc
-
-import (
-	"encoding/json"
-	"io"
-	"net/http"
-	"strconv"
-	"strings"
-
-	jsonpatch "github.com/evanphx/json-patch/v5"
-	"github.com/oxtoacart/bpool"
-	jsonrpc "github.com/unistack-org/micro-codec-jsonrpc"
-	protorpc "github.com/unistack-org/micro-codec-protorpc"
-	"github.com/unistack-org/micro/v3/api"
-	"github.com/unistack-org/micro/v3/api/handler"
-	"github.com/unistack-org/micro/v3/api/internal/proto"
-	"github.com/unistack-org/micro/v3/client"
-	"github.com/unistack-org/micro/v3/codec"
-	"github.com/unistack-org/micro/v3/errors"
-	"github.com/unistack-org/micro/v3/logger"
-	"github.com/unistack-org/micro/v3/metadata"
-	"github.com/unistack-org/micro/v3/util/ctx"
-	"github.com/unistack-org/micro/v3/util/qson"
-	"github.com/unistack-org/micro/v3/util/router"
-)
-
-const (
-	Handler = "rpc"
-)
-
-var (
-	// supported json codecs
-	jsonCodecs = []string{
-		"application/grpc+json",
-		"application/json",
-		"application/json-rpc",
-	}
-
-	// support proto codecs
-	protoCodecs = []string{
-		"application/grpc",
-		"application/grpc+proto",
-		"application/proto",
-		"application/protobuf",
-		"application/proto-rpc",
-		"application/octet-stream",
-	}
-
-	bufferPool = bpool.NewSizedBufferPool(1024, 8)
-)
-
-type rpcHandler struct {
-	opts handler.Options
-	s    *api.Service
-}
-
-type buffer struct {
-	io.ReadCloser
-}
-
-func (b *buffer) Write(_ []byte) (int, error) {
-	return 0, nil
-}
-
-func (h *rpcHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	bsize := handler.DefaultMaxRecvSize
-	if h.opts.MaxRecvSize > 0 {
-		bsize = h.opts.MaxRecvSize
-	}
-
-	r.Body = http.MaxBytesReader(w, r.Body, bsize)
-
-	defer r.Body.Close()
-	var service *api.Service
-
-	if h.s != nil {
-		// we were given the service
-		service = h.s
-	} else if h.opts.Router != nil {
-		// try get service from router
-		s, err := h.opts.Router.Route(r)
-		if err != nil {
-			writeError(w, r, errors.InternalServerError("go.micro.api", err.Error()))
-			return
-		}
-		service = s
-	} else {
-		// we have no way of routing the request
-		writeError(w, r, errors.InternalServerError("go.micro.api", "no route found"))
-		return
-	}
-
-	ct := r.Header.Get("Content-Type")
-
-	// Strip charset from Content-Type (like `application/json; charset=UTF-8`)
-	if idx := strings.IndexRune(ct, ';'); idx >= 0 {
-		ct = ct[:idx]
-	}
-
-	// micro client
-	c := h.opts.Client
-
-	// create context
-	cx := ctx.FromRequest(r)
-
-	// set merged context to request
-	*r = *r.Clone(cx)
-	// if stream we currently only support json
-	if isStream(r, service) {
-		serveWebsocket(cx, w, r, service, c)
-		return
-	}
-
-	// create custom router
-	callOpt := client.WithRouter(router.New(service.Services))
-
-	// walk the standard call path
-	// get payload
-	br, err := requestPayload(r)
-	if err != nil {
-		writeError(w, r, err)
-		return
-	}
-
-	var rsp []byte
-
-	switch {
-	// proto codecs
-	case hasCodec(ct, protoCodecs):
-		request := &proto.Message{}
-		// if the extracted payload isn't empty lets use it
-		if len(br) > 0 {
-			request = proto.NewMessage(br)
-		}
-
-		// create request/response
-		response := &proto.Message{}
-
-		req := c.NewRequest(
-			service.Name,
-			service.Endpoint.Name,
-			request,
-			client.WithContentType(ct),
-		)
-
-		// make the call
-		if err := c.Call(cx, req, response, callOpt); err != nil {
-			writeError(w, r, err)
-			return
-		}
-
-		// marshall response
-		rsp, err = response.Marshal()
-		if err != nil {
-			writeError(w, r, err)
-			return
-		}
-
-	default:
-		// if json codec is not present set to json
-		if !hasCodec(ct, jsonCodecs) {
-			ct = "application/json"
-		}
-
-		// default to trying json
-		var request json.RawMessage
-		// if the extracted payload isn't empty lets use it
-		if len(br) > 0 {
-			request = json.RawMessage(br)
-		}
-
-		// create request/response
-		var response json.RawMessage
-
-		req := c.NewRequest(
-			service.Name,
-			service.Endpoint.Name,
-			&request,
-			client.WithContentType(ct),
-		)
-		// make the call
-		if err := c.Call(cx, req, &response, callOpt); err != nil {
-			writeError(w, r, err)
-			return
-		}
-
-		// marshall response
-		rsp, err = response.MarshalJSON()
-		if err != nil {
-			writeError(w, r, err)
-			return
-		}
-	}
-
-	// write the response
-	writeResponse(w, r, rsp)
-}
-
-func (rh *rpcHandler) String() string {
-	return "rpc"
-}
-
-func hasCodec(ct string, codecs []string) bool {
-	for _, codec := range codecs {
-		if ct == codec {
-			return true
-		}
-	}
-	return false
-}
-
-// requestPayload takes a *http.Request.
-// If the request is a GET the query string parameters are extracted and marshaled to JSON and the raw bytes are returned.
-// If the request method is a POST the request body is read and returned
-func requestPayload(r *http.Request) ([]byte, error) {
-	var err error
-
-	// we have to decode json-rpc and proto-rpc because we suck
-	// well actually because there's no proxy codec right now
-
-	ct := r.Header.Get("Content-Type")
-	switch {
-	case strings.Contains(ct, "application/json-rpc"):
-		msg := codec.Message{
-			Type:   codec.Request,
-			Header: metadata.New(0),
-		}
-		c := jsonrpc.NewCodec(&buffer{r.Body})
-		if err = c.ReadHeader(&msg, codec.Request); err != nil {
-			return nil, err
-		}
-		var raw json.RawMessage
-		if err = c.ReadBody(&raw); err != nil {
-			return nil, err
-		}
-		return ([]byte)(raw), nil
-	case strings.Contains(ct, "application/proto-rpc"), strings.Contains(ct, "application/octet-stream"):
-		msg := codec.Message{
-			Type:   codec.Request,
-			Header: metadata.New(0),
-		}
-		c := protorpc.NewCodec(&buffer{r.Body})
-		if err = c.ReadHeader(&msg, codec.Request); err != nil {
-			return nil, err
-		}
-		var raw proto.Message
-		if err = c.ReadBody(&raw); err != nil {
-			return nil, err
-		}
-		return raw.Marshal()
-	case strings.Contains(ct, "application/www-x-form-urlencoded"):
-		if err = r.ParseForm(); err != nil {
-			return nil, err
-		}
-
-		// generate a new set of values from the form
-		vals := make(map[string]string, len(r.Form))
-		for k, v := range r.Form {
-			vals[k] = strings.Join(v, ",")
-		}
-
-		// marshal
-		return json.Marshal(vals)
-		// TODO: application/grpc
-	}
-
-	// otherwise as per usual
-	ctx := r.Context()
-	// dont user metadata.FromContext as it mangles names
-	md, ok := metadata.FromContext(ctx)
-	if !ok {
-		md = metadata.New(0)
-	}
-
-	// allocate maximum
-	matches := make(map[string]interface{}, len(md))
-	bodydst := ""
-
-	// get fields from url path
-	for k, v := range md {
-		k = strings.ToLower(k)
-		// filter own keys
-		if strings.HasPrefix(k, "x-api-field-") {
-			matches[strings.TrimPrefix(k, "x-api-field-")] = v
-			delete(md, k)
-		} else if k == "x-api-body" {
-			bodydst = v
-			delete(md, k)
-		}
-	}
-
-	// map of all fields
-	req := make(map[string]interface{}, len(md))
-
-	// get fields from url values
-	if len(r.URL.RawQuery) > 0 {
-		umd := make(map[string]interface{})
-		err = qson.Unmarshal(&umd, r.URL.RawQuery)
-		if err != nil {
-			return nil, err
-		}
-		for k, v := range umd {
-			matches[k] = v
-		}
-	}
-
-	// restore context without fields
-	*r = *r.Clone(metadata.NewContext(ctx, md))
-
-	for k, v := range matches {
-		ps := strings.Split(k, ".")
-		if len(ps) == 1 {
-			req[k] = v
-			continue
-		}
-		em := make(map[string]interface{})
-		em[ps[len(ps)-1]] = v
-		for i := len(ps) - 2; i > 0; i-- {
-			nm := make(map[string]interface{})
-			nm[ps[i]] = em
-			em = nm
-		}
-		if vm, ok := req[ps[0]]; ok {
-			// nested map
-			nm := vm.(map[string]interface{})
-			for vk, vv := range em {
-				nm[vk] = vv
-			}
-			req[ps[0]] = nm
-		} else {
-			req[ps[0]] = em
-		}
-	}
-	pathbuf := []byte("{}")
-	if len(req) > 0 {
-		pathbuf, err = json.Marshal(req)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	urlbuf := []byte("{}")
-	out, err := jsonpatch.MergeMergePatches(urlbuf, pathbuf)
-	if err != nil {
-		return nil, err
-	}
-
-	switch r.Method {
-	case "GET":
-		// empty response
-		if strings.Contains(ct, "application/json") && string(out) == "{}" {
-			return out, nil
-		} else if string(out) == "{}" && !strings.Contains(ct, "application/json") {
-			return []byte{}, nil
-		}
-		return out, nil
-	case "PATCH", "POST", "PUT", "DELETE":
-		bodybuf := []byte("{}")
-		buf := bufferPool.Get()
-		defer bufferPool.Put(buf)
-		if _, err := buf.ReadFrom(r.Body); err != nil {
-			return nil, err
-		}
-		if b := buf.Bytes(); len(b) > 0 {
-			bodybuf = b
-		}
-		if bodydst == "" || bodydst == "*" {
-			if out, err = jsonpatch.MergeMergePatches(out, bodybuf); err == nil {
-				return out, nil
-			}
-		}
-		var jsonbody map[string]interface{}
-		if json.Valid(bodybuf) {
-			if err = json.Unmarshal(bodybuf, &jsonbody); err != nil {
-				return nil, err
-			}
-		}
-		dstmap := make(map[string]interface{})
-		ps := strings.Split(bodydst, ".")
-		if len(ps) == 1 {
-			if jsonbody != nil {
-				dstmap[ps[0]] = jsonbody
-			} else {
-				// old unexpected behaviour
-				dstmap[ps[0]] = bodybuf
-			}
-		} else {
-			em := make(map[string]interface{})
-			if jsonbody != nil {
-				em[ps[len(ps)-1]] = jsonbody
-			} else {
-				// old unexpected behaviour
-				em[ps[len(ps)-1]] = bodybuf
-			}
-			for i := len(ps) - 2; i > 0; i-- {
-				nm := make(map[string]interface{})
-				nm[ps[i]] = em
-				em = nm
-			}
-			dstmap[ps[0]] = em
-		}
-
-		bodyout, err := json.Marshal(dstmap)
-		if err != nil {
-			return nil, err
-		}
-
-		if out, err = jsonpatch.MergeMergePatches(out, bodyout); err == nil {
-			return out, nil
-		}
-
-		//fallback to previous unknown behaviour
-		return bodybuf, nil
-
-	}
-
-	return []byte{}, nil
-}
-
-func writeError(w http.ResponseWriter, r *http.Request, err error) {
-	ce := errors.Parse(err.Error())
-
-	switch ce.Code {
-	case 0:
-		// assuming it's totally screwed
-		ce.Code = 500
-		ce.Id = "go.micro.api"
-		ce.Status = http.StatusText(500)
-		ce.Detail = "error during request: " + ce.Detail
-		w.WriteHeader(500)
-	default:
-		w.WriteHeader(int(ce.Code))
-	}
-
-	// response content type
-	w.Header().Set("Content-Type", "application/json")
-
-	// Set trailers
-	if strings.Contains(r.Header.Get("Content-Type"), "application/grpc") {
-		w.Header().Set("Trailer", "grpc-status")
-		w.Header().Set("Trailer", "grpc-message")
-		w.Header().Set("grpc-status", "13")
-		w.Header().Set("grpc-message", ce.Detail)
-	}
-
-	_, werr := w.Write([]byte(ce.Error()))
-	if werr != nil {
-		if logger.V(logger.ErrorLevel) {
-			logger.Error(werr.Error())
-		}
-	}
-}
-
-func writeResponse(w http.ResponseWriter, r *http.Request, rsp []byte) {
-	w.Header().Set("Content-Type", r.Header.Get("Content-Type"))
-	w.Header().Set("Content-Length", strconv.Itoa(len(rsp)))
-
-	// Set trailers
-	if strings.Contains(r.Header.Get("Content-Type"), "application/grpc") {
-		w.Header().Set("Trailer", "grpc-status")
-		w.Header().Set("Trailer", "grpc-message")
-		w.Header().Set("grpc-status", "0")
-		w.Header().Set("grpc-message", "")
-	}
-
-	// write 204 status if rsp is nil
-	if len(rsp) == 0 {
-		w.WriteHeader(http.StatusNoContent)
-	}
-
-	// write response
-	_, err := w.Write(rsp)
-	if err != nil {
-		if logger.V(logger.ErrorLevel) {
-			logger.Error(err.Error())
-		}
-	}
-
-}
-
-func NewHandler(opts ...handler.Option) handler.Handler {
-	options := handler.NewOptions(opts...)
-	return &rpcHandler{
-		opts: options,
-	}
-}
-
-func WithService(s *api.Service, opts ...handler.Option) handler.Handler {
-	options := handler.NewOptions(opts...)
-	return &rpcHandler{
-		opts: options,
-		s:    s,
-	}
-}

api/handler/rpc/rpc_test.go

@@ -1,112 +0,0 @@
-package rpc
-
-import (
-	"bytes"
-	"net/http"
-	"testing"
-
-	go_api "github.com/unistack-org/micro/v3/api/proto"
-	jsonpb "google.golang.org/protobuf/encoding/protojson"
-	"google.golang.org/protobuf/proto"
-)
-
-func TestRequestPayloadFromRequest(t *testing.T) {
-
-	// our test event so that we can validate serialising / deserializing of true protos works
-	protoEvent := go_api.Event{
-		Name: "Test",
-	}
-
-	protoBytes, err := proto.Marshal(&protoEvent)
-	if err != nil {
-		t.Fatal("Failed to marshal proto", err)
-	}
-
-	jsonBytes, err := jsonpb.Marshal(&protoEvent)
-	if err != nil {
-		t.Fatal("Failed to marshal proto to JSON ", err)
-	}
-
-	jsonUrlBytes := []byte(`{"key1":"val1","key2":"val2","name":"Test"}`)
-
-	t.Run("extracting a json from a POST request with url params", func(t *testing.T) {
-		r, err := http.NewRequest("POST", "http://localhost/my/path?key1=val1&key2=val2", bytes.NewReader(jsonBytes))
-		if err != nil {
-			t.Fatalf("Failed to created http.Request: %v", err)
-		}
-
-		extByte, err := requestPayload(r)
-		if err != nil {
-			t.Fatalf("Failed to extract payload from request: %v", err)
-		}
-		if string(extByte) != string(jsonUrlBytes) {
-			t.Fatalf("Expected %v and %v to match", string(extByte), jsonUrlBytes)
-		}
-	})
-
-	t.Run("extracting a proto from a POST request", func(t *testing.T) {
-		r, err := http.NewRequest("POST", "http://localhost/my/path", bytes.NewReader(protoBytes))
-		if err != nil {
-			t.Fatalf("Failed to created http.Request: %v", err)
-		}
-
-		extByte, err := requestPayload(r)
-		if err != nil {
-			t.Fatalf("Failed to extract payload from request: %v", err)
-		}
-		if string(extByte) != string(protoBytes) {
-			t.Fatalf("Expected %v and %v to match", string(extByte), string(protoBytes))
-		}
-	})
-
-	t.Run("extracting JSON from a POST request", func(t *testing.T) {
-		r, err := http.NewRequest("POST", "http://localhost/my/path", bytes.NewReader(jsonBytes))
-		if err != nil {
-			t.Fatalf("Failed to created http.Request: %v", err)
-		}
-
-		extByte, err := requestPayload(r)
-		if err != nil {
-			t.Fatalf("Failed to extract payload from request: %v", err)
-		}
-		if string(extByte) != string(jsonBytes) {
-			t.Fatalf("Expected %v and %v to match", string(extByte), string(jsonBytes))
-		}
-	})
-
-	t.Run("extracting params from a GET request", func(t *testing.T) {
-
-		r, err := http.NewRequest("GET", "http://localhost/my/path", nil)
-		if err != nil {
-			t.Fatalf("Failed to created http.Request: %v", err)
-		}
-
-		q := r.URL.Query()
-		q.Add("name", "Test")
-		r.URL.RawQuery = q.Encode()
-
-		extByte, err := requestPayload(r)
-		if err != nil {
-			t.Fatalf("Failed to extract payload from request: %v", err)
-		}
-		if string(extByte) != string(jsonBytes) {
-			t.Fatalf("Expected %v and %v to match", string(extByte), string(jsonBytes))
-		}
-	})
-
-	t.Run("GET request with no params", func(t *testing.T) {
-
-		r, err := http.NewRequest("GET", "http://localhost/my/path", nil)
-		if err != nil {
-			t.Fatalf("Failed to created http.Request: %v", err)
-		}
-
-		extByte, err := requestPayload(r)
-		if err != nil {
-			t.Fatalf("Failed to extract payload from request: %v", err)
-		}
-		if string(extByte) != "" {
-			t.Fatalf("Expected %v and %v to match", string(extByte), "")
-		}
-	})
-}

api/handler/rpc/stream.go

@@ -1,263 +0,0 @@
-package rpc
-
-import (
-	"bytes"
-	"context"
-	"encoding/json"
-	"io"
-	"net/http"
-	"strings"
-	"time"
-
-	"github.com/gobwas/httphead"
-	"github.com/gobwas/ws"
-	"github.com/gobwas/ws/wsutil"
-	raw "github.com/unistack-org/micro-codec-bytes"
-	"github.com/unistack-org/micro/v3/api"
-	"github.com/unistack-org/micro/v3/client"
-	"github.com/unistack-org/micro/v3/logger"
-	"github.com/unistack-org/micro/v3/util/router"
-)
-
-// serveWebsocket will stream rpc back over websockets assuming json
-func serveWebsocket(ctx context.Context, w http.ResponseWriter, r *http.Request, service *api.Service, c client.Client) {
-	var op ws.OpCode
-
-	ct := r.Header.Get("Content-Type")
-	// Strip charset from Content-Type (like `application/json; charset=UTF-8`)
-	if idx := strings.IndexRune(ct, ';'); idx >= 0 {
-		ct = ct[:idx]
-	}
-
-	// check proto from request
-	switch ct {
-	case "application/json":
-		op = ws.OpText
-	default:
-		op = ws.OpBinary
-	}
-
-	hdr := make(http.Header)
-	if proto, ok := r.Header["Sec-WebSocket-Protocol"]; ok {
-		for _, p := range proto {
-			switch p {
-			case "binary":
-				hdr["Sec-WebSocket-Protocol"] = []string{"binary"}
-				op = ws.OpBinary
-			default:
-				op = ws.OpBinary
-			}
-		}
-	}
-	payload, err := requestPayload(r)
-	if err != nil {
-		if logger.V(logger.ErrorLevel) {
-			logger.Error(err.Error())
-		}
-		return
-	}
-
-	upgrader := ws.HTTPUpgrader{Timeout: 5 * time.Second,
-		Protocol: func(proto string) bool {
-			if strings.Contains(proto, "binary") {
-				return true
-			}
-			// fallback to support all protocols now
-			return true
-		},
-		Extension: func(httphead.Option) bool {
-			// disable extensions for compatibility
-			return false
-		},
-		Header: hdr,
-	}
-
-	conn, rw, _, err := upgrader.Upgrade(r, w)
-	if err != nil {
-		if logger.V(logger.ErrorLevel) {
-			logger.Error(err.Error())
-		}
-		return
-	}
-
-	defer func() {
-		if err := conn.Close(); err != nil {
-			if logger.V(logger.ErrorLevel) {
-				logger.Error(err.Error())
-			}
-			return
-		}
-	}()
-
-	var request interface{}
-	if !bytes.Equal(payload, []byte(`{}`)) {
-		switch ct {
-		case "application/json", "":
-			m := json.RawMessage(payload)
-			request = &m
-		default:
-			request = &raw.Frame{Data: payload}
-		}
-	}
-
-	// we always need to set content type for message
-	if ct == "" {
-		ct = "application/json"
-	}
-	req := c.NewRequest(
-		service.Name,
-		service.Endpoint.Name,
-		request,
-		client.WithContentType(ct),
-		client.StreamingRequest(),
-	)
-
-	// create custom router
-	callOpt := client.WithRouter(router.New(service.Services))
-
-	// create a new stream
-	stream, err := c.Stream(ctx, req, callOpt)
-	if err != nil {
-		if logger.V(logger.ErrorLevel) {
-			logger.Error(err.Error())
-		}
-		return
-	}
-
-	if request != nil {
-		if err = stream.Send(request); err != nil {
-			if logger.V(logger.ErrorLevel) {
-				logger.Error(err.Error())
-			}
-			return
-		}
-	}
-
-	go writeLoop(rw, stream)
-
-	rsp := stream.Response()
-
-	// receive from stream and send to client
-	for {
-		select {
-		case <-ctx.Done():
-			return
-		case <-stream.Context().Done():
-			return
-		default:
-			// read backend response body
-			buf, err := rsp.Read()
-			if err != nil {
-				// wants to avoid import  grpc/status.Status
-				if strings.Contains(err.Error(), "context canceled") {
-					return
-				}
-				if logger.V(logger.ErrorLevel) {
-					logger.Error(err.Error())
-				}
-				return
-			}
-
-			// write the response
-			if err := wsutil.WriteServerMessage(rw, op, buf); err != nil {
-				if logger.V(logger.ErrorLevel) {
-					logger.Error(err.Error())
-				}
-				return
-			}
-			if err = rw.Flush(); err != nil {
-				if logger.V(logger.ErrorLevel) {
-					logger.Error(err.Error())
-				}
-				return
-			}
-		}
-	}
-}
-
-// writeLoop
-func writeLoop(rw io.ReadWriter, stream client.Stream) {
-	// close stream when done
-	defer stream.Close()
-
-	for {
-		select {
-		case <-stream.Context().Done():
-			return
-		default:
-			buf, op, err := wsutil.ReadClientData(rw)
-			if err != nil {
-				if wserr, ok := err.(wsutil.ClosedError); ok {
-					switch wserr.Code {
-					case ws.StatusGoingAway:
-						// this happens when user leave the page
-						return
-					case ws.StatusNormalClosure, ws.StatusNoStatusRcvd:
-						// this happens when user close ws connection, or we don't get any status
-						return
-					}
-				}
-				if logger.V(logger.ErrorLevel) {
-					logger.Error(err.Error())
-				}
-				return
-			}
-			switch op {
-			default:
-				// not relevant
-				continue
-			case ws.OpText, ws.OpBinary:
-				break
-			}
-			// send to backend
-			// default to trying json
-			// if the extracted payload isn't empty lets use it
-			request := &raw.Frame{Data: buf}
-			if err := stream.Send(request); err != nil {
-				if logger.V(logger.ErrorLevel) {
-					logger.Error(err.Error())
-				}
-				return
-			}
-		}
-	}
-}
-
-func isStream(r *http.Request, srv *api.Service) bool {
-	// check if it's a web socket
-	if !isWebSocket(r) {
-		return false
-	}
-	// check if the endpoint supports streaming
-	for _, service := range srv.Services {
-		for _, ep := range service.Endpoints {
-			// skip if it doesn't match the name
-			if ep.Name != srv.Endpoint.Name {
-				continue
-			}
-			// matched if the name
-			if v := ep.Metadata["stream"]; v == "true" {
-				return true
-			}
-		}
-	}
-	return false
-}
-
-func isWebSocket(r *http.Request) bool {
-	contains := func(key, val string) bool {
-		vv := strings.Split(r.Header.Get(key), ",")
-		for _, v := range vv {
-			if val == strings.ToLower(strings.TrimSpace(v)) {
-				return true
-			}
-		}
-		return false
-	}
-
-	if contains("Connection", "upgrade") && contains("Upgrade", "websocket") {
-		return true
-	}
-
-	return false
-}

api/handler/web/web.go

@@ -14,7 +14,7 @@ import (
 
 	"github.com/unistack-org/micro/v3/api"
 	"github.com/unistack-org/micro/v3/api/handler"
-	"github.com/unistack-org/micro/v3/registry"
+	"github.com/unistack-org/micro/v3/register"
 )
 
 const (
@@ -72,7 +72,7 @@ func (wh *webHandler) getService(r *http.Request) (string, error) {
 	}
 
 	// get the nodes
-	nodes := make([]*registry.Node, 0, len(service.Services))
+	nodes := make([]*register.Node, 0, len(service.Services))
 	for _, srv := range service.Services {
 		nodes = append(nodes, srv.Nodes...)
 	}

api/resolver/options.go

@@ -1,13 +1,16 @@
 package resolver
 
 import (
-	"github.com/unistack-org/micro/v3/registry"
+	"context"
+
+	"github.com/unistack-org/micro/v3/register"
 )
 
 // Options struct
 type Options struct {
 	Handler       string
 	ServicePrefix string
+	Context       context.Context
 }
 
 // Option func
@@ -29,7 +32,9 @@ func WithServicePrefix(p string) Option {
 
 // NewOptions returns new initialised options
 func NewOptions(opts ...Option) Options {
-	options := Options{}
+	options := Options{
+		Context: context.Background(),
+	}
 	for _, o := range opts {
 		o(&options)
 	}
@@ -53,7 +58,7 @@ func Domain(n string) ResolveOption {
 
 // NewResolveOptions returns new initialised resolve options
 func NewResolveOptions(opts ...ResolveOption) ResolveOptions {
-	options := ResolveOptions{Domain: registry.DefaultDomain}
+	options := ResolveOptions{Domain: register.DefaultDomain}
 	for _, o := range opts {
 		o(&options)
 	}

api/resolver/subdomain/subdomain.go

@@ -55,7 +55,7 @@ func (r *Resolver) Domain(req *http.Request) string {
 	domain, err := publicsuffix.EffectiveTLDPlusOne(host)
 	if err != nil {
 		if logger.V(logger.DebugLevel) {
-			logger.Debug("Unable to extract domain from %v", host)
+			logger.Debug(r.opts.Context, "Unable to extract domain from %v", host)
 		}
 		return ""
 	}

api/router/options.go

@@ -5,13 +5,15 @@ import (
 
 	"github.com/unistack-org/micro/v3/api/resolver"
 	"github.com/unistack-org/micro/v3/api/resolver/vpath"
-	"github.com/unistack-org/micro/v3/registry"
+	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/register"
 )
 
 type Options struct {
 	Handler  string
-	Registry registry.Registry
+	Register register.Register
 	Resolver resolver.Resolver
+	Logger   logger.Logger
 	Context  context.Context
 }
 
@@ -50,10 +52,10 @@ func WithHandler(h string) Option {
 	}
 }
 
-// WithRegistry sets the registry
-func WithRegistry(r registry.Registry) Option {
+// WithRegister sets the register
+func WithRegister(r register.Register) Option {
 	return func(o *Options) {
-		o.Registry = r
+		o.Register = r
 	}
 }
 

api/router/router.go

@@ -11,6 +11,8 @@ import (
 type Router interface {
 	// Returns options
 	Options() Options
+	// Init initialize router
+	Init(...Option) error
 	// Stop the router
 	Close() error
 	// Endpoint returns an api.Service endpoint or an error if it does not exist
@@ -21,4 +23,6 @@ type Router interface {
 	Deregister(ep *api.Endpoint) error
 	// Route returns an api.Service route
 	Route(r *http.Request) (*api.Service, error)
+	// String represenation of router
+	String() string
 }

api/server/acme/acme.go

@@ -1,29 +0,0 @@
-// Package acme abstracts away various ACME libraries
-package acme
-
-import (
-	"crypto/tls"
-	"errors"
-	"net"
-)
-
-var (
-	// ErrProviderNotImplemented can be returned when attempting to
-	// instantiate an unimplemented provider
-	ErrProviderNotImplemented = errors.New("Provider not implemented")
-)
-
-// Provider is a ACME provider interface
-type Provider interface {
-	Init(...Option) error
-	// Listen returns a new listener
-	Listen(...string) (net.Listener, error)
-	// TLSConfig returns a tls config
-	TLSConfig(...string) (*tls.Config, error)
-}
-
-// The Let's Encrypt ACME endpoints
-const (
-	LetsEncryptStagingCA    = "https://acme-staging-v02.api.letsencrypt.org/directory"
-	LetsEncryptProductionCA = "https://acme-v02.api.letsencrypt.org/directory"
-)

api/server/acme/autocert/autocert.go

@@ -1,50 +0,0 @@
-// Package autocert is the ACME provider from golang.org/x/crypto/acme/autocert
-// This provider does not take any config.
-package autocert
-
-import (
-	"crypto/tls"
-	"net"
-	"os"
-
-	"github.com/unistack-org/micro/v3/api/server/acme"
-	"github.com/unistack-org/micro/v3/logger"
-	"golang.org/x/crypto/acme/autocert"
-)
-
-// autoCertACME is the ACME provider from golang.org/x/crypto/acme/autocert
-type autocertProvider struct{}
-
-func (a *autocertProvider) Init(opts ...acme.Option) error {
-	return nil
-}
-
-// Listen implements acme.Provider
-func (a *autocertProvider) Listen(hosts ...string) (net.Listener, error) {
-	return autocert.NewListener(hosts...), nil
-}
-
-// TLSConfig returns a new tls config
-func (a *autocertProvider) TLSConfig(hosts ...string) (*tls.Config, error) {
-	// create a new manager
-	m := &autocert.Manager{
-		Prompt: autocert.AcceptTOS,
-	}
-	if len(hosts) > 0 {
-		m.HostPolicy = autocert.HostWhitelist(hosts...)
-	}
-	dir := cacheDir()
-	if err := os.MkdirAll(dir, 0700); err != nil {
-		if logger.V(logger.InfoLevel) {
-			logger.Info("warning: autocert not using a cache: %v", err)
-		}
-	} else {
-		m.Cache = autocert.DirCache(dir)
-	}
-	return m.TLSConfig(), nil
-}
-
-// New returns an autocert acme.Provider
-func NewProvider() acme.Provider {
-	return &autocertProvider{}
-}

api/server/acme/autocert/autocert_test.go

@@ -1,16 +0,0 @@
-package autocert
-
-import (
-	"testing"
-)
-
-func TestAutocert(t *testing.T) {
-	l := NewProvider()
-	if _, ok := l.(*autocertProvider); !ok {
-		t.Error("NewProvider() didn't return an autocertProvider")
-	}
-	// TODO: Travis CI doesn't let us bind :443
-	// if _, err := l.NewListener(); err != nil {
-	// 	t.Error(err.Error())
-	// }
-}

api/server/acme/autocert/cache.go

@@ -1,37 +0,0 @@
-package autocert
-
-import (
-	"os"
-	"path/filepath"
-	"runtime"
-)
-
-func homeDir() string {
-	if runtime.GOOS == "windows" {
-		return os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
-	}
-	if h := os.Getenv("HOME"); h != "" {
-		return h
-	}
-	return "/"
-}
-
-func cacheDir() string {
-	const base = "golang-autocert"
-	switch runtime.GOOS {
-	case "darwin":
-		return filepath.Join(homeDir(), "Library", "Caches", base)
-	case "windows":
-		for _, ev := range []string{"APPDATA", "CSIDL_APPDATA", "TEMP", "TMP"} {
-			if v := os.Getenv(ev); v != "" {
-				return filepath.Join(v, base)
-			}
-		}
-		// Worst case:
-		return filepath.Join(homeDir(), base)
-	}
-	if xdg := os.Getenv("XDG_CACHE_HOME"); xdg != "" {
-		return filepath.Join(xdg, base)
-	}
-	return filepath.Join(homeDir(), ".cache", base)
-}

api/server/acme/certmagic/certmagic.go

@@ -1,71 +0,0 @@
-// Package certmagic is the ACME provider from github.com/caddyserver/certmagic
-package certmagic
-
-import (
-	"crypto/tls"
-	"fmt"
-	"math/rand"
-	"net"
-	"time"
-
-	"github.com/caddyserver/certmagic"
-	"github.com/unistack-org/micro/v3/api/server/acme"
-)
-
-type certmagicProvider struct {
-	opts acme.Options
-}
-
-// TODO: set self-contained options
-func (c *certmagicProvider) setup() {
-	certmagic.DefaultACME.CA = c.opts.CA
-	if c.opts.ChallengeProvider != nil {
-		// Enabling DNS Challenge disables the other challenges
-		certmagic.DefaultACME.DNSProvider = c.opts.ChallengeProvider
-	}
-	if c.opts.OnDemand {
-		certmagic.Default.OnDemand = new(certmagic.OnDemandConfig)
-	}
-	if c.opts.Cache != nil {
-		// already validated by new()
-		certmagic.Default.Storage = c.opts.Cache.(certmagic.Storage)
-	}
-	// If multiple instances of the provider are running, inject some
-	// randomness so they don't collide
-	// RenewalWindowRatio [0.33 - 0.50)
-	rand.Seed(time.Now().UnixNano())
-	randomRatio := float64(rand.Intn(17)+33) * 0.01
-	certmagic.Default.RenewalWindowRatio = randomRatio
-}
-
-func (c *certmagicProvider) Listen(hosts ...string) (net.Listener, error) {
-	c.setup()
-	return certmagic.Listen(hosts)
-}
-
-func (c *certmagicProvider) TLSConfig(hosts ...string) (*tls.Config, error) {
-	c.setup()
-	return certmagic.TLS(hosts)
-}
-
-func (p *certmagicProvider) Init(opts ...acme.Option) error {
-	if p.opts.Cache != nil {
-		if _, ok := p.opts.Cache.(certmagic.Storage); !ok {
-			return fmt.Errorf("ACME: cache provided doesn't implement certmagic's Storage interface")
-		}
-	}
-	return nil
-}
-
-// NewProvider returns a certmagic provider
-func NewProvider(options ...acme.Option) acme.Provider {
-	opts := acme.DefaultOptions()
-
-	for _, o := range options {
-		o(&opts)
-	}
-
-	return &certmagicProvider{
-		opts: opts,
-	}
-}

api/server/acme/certmagic/storage.go

@@ -1,147 +0,0 @@
-package certmagic
-
-import (
-	"bytes"
-	"encoding/gob"
-	"errors"
-	"fmt"
-	"path"
-	"strings"
-	"time"
-
-	"github.com/caddyserver/certmagic"
-	"github.com/unistack-org/micro/v3/store"
-	"github.com/unistack-org/micro/v3/sync"
-)
-
-// File represents a "File" that will be stored in store.Store - the contents and last modified time
-type File struct {
-	// last modified time
-	LastModified time.Time
-	// Contents
-	Contents []byte
-}
-
-// storage is an implementation of certmagic.Storage using micro's sync.Map and store.Store interfaces.
-// As certmagic storage expects a filesystem (with stat() abilities) we have to implement
-// the bare minimum of metadata.
-type storage struct {
-	lock  sync.Sync
-	store store.Store
-}
-
-func (s *storage) Lock(key string) error {
-	return s.lock.Lock(key, sync.LockTTL(10*time.Minute))
-}
-
-func (s *storage) Unlock(key string) error {
-	return s.lock.Unlock(key)
-}
-
-func (s *storage) Store(key string, value []byte) error {
-	f := File{
-		LastModified: time.Now(),
-		Contents:     value,
-	}
-	buf := &bytes.Buffer{}
-	e := gob.NewEncoder(buf)
-	if err := e.Encode(f); err != nil {
-		return err
-	}
-	r := &store.Record{
-		Key:   key,
-		Value: buf.Bytes(),
-	}
-	return s.store.Write(s.store.Options().Context, r)
-}
-
-func (s *storage) Load(key string) ([]byte, error) {
-	if !s.Exists(key) {
-		return nil, certmagic.ErrNotExist(errors.New(key + " doesn't exist"))
-	}
-	records, err := s.store.Read(s.store.Options().Context, key)
-	if err != nil {
-		return nil, err
-	}
-	if len(records) != 1 {
-		return nil, fmt.Errorf("ACME Storage: multiple records matched key %s", key)
-	}
-	b := bytes.NewBuffer(records[0].Value)
-	d := gob.NewDecoder(b)
-	var f File
-	err = d.Decode(&f)
-	if err != nil {
-		return nil, err
-	}
-	return f.Contents, nil
-}
-
-func (s *storage) Delete(key string) error {
-	return s.store.Delete(s.store.Options().Context, key)
-}
-
-func (s *storage) Exists(key string) bool {
-	if _, err := s.store.Read(s.store.Options().Context, key); err != nil {
-		return false
-	}
-	return true
-}
-
-func (s *storage) List(prefix string, recursive bool) ([]string, error) {
-	keys, err := s.store.List(s.store.Options().Context)
-	if err != nil {
-		return nil, err
-	}
-
-	//nolint:prealloc
-	var results []string
-	for _, k := range keys {
-		if strings.HasPrefix(k, prefix) {
-			results = append(results, k)
-		}
-	}
-	if recursive {
-		return results, nil
-	}
-	keysMap := make(map[string]bool)
-	for _, key := range results {
-		dir := strings.Split(strings.TrimPrefix(key, prefix+"/"), "/")
-		keysMap[dir[0]] = true
-	}
-	results = make([]string, 0)
-	for k := range keysMap {
-		results = append(results, path.Join(prefix, k))
-	}
-	return results, nil
-}
-
-func (s *storage) Stat(key string) (certmagic.KeyInfo, error) {
-	records, err := s.store.Read(s.store.Options().Context, key)
-	if err != nil {
-		return certmagic.KeyInfo{}, err
-	}
-	if len(records) != 1 {
-		return certmagic.KeyInfo{}, fmt.Errorf("ACME Storage: multiple records matched key %s", key)
-	}
-	b := bytes.NewBuffer(records[0].Value)
-	d := gob.NewDecoder(b)
-	var f File
-	err = d.Decode(&f)
-	if err != nil {
-		return certmagic.KeyInfo{}, err
-	}
-	return certmagic.KeyInfo{
-		Key:        key,
-		Modified:   f.LastModified,
-		Size:       int64(len(f.Contents)),
-		IsTerminal: false,
-	}, nil
-}
-
-// NewStorage returns a certmagic.Storage backed by a go-micro/lock and go-micro/store
-func NewStorage(lock sync.Sync, store store.Store) certmagic.Storage {
-	return &storage{
-		lock:  lock,
-		store: store,
-	}
-}

api/server/acme/options.go

@@ -1,73 +0,0 @@
-package acme
-
-import "github.com/go-acme/lego/v3/challenge"
-
-// Option (or Options) are passed to New() to configure providers
-type Option func(o *Options)
-
-// Options represents various options you can present to ACME providers
-type Options struct {
-	// AcceptTLS must be set to true to indicate that you have read your
-	// provider's terms of service.
-	AcceptToS bool
-	// CA is the CA to use
-	CA string
-	// ChallengeProvider is a go-acme/lego challenge provider. Set this if you
-	// want to use DNS Challenges. Otherwise, tls-alpn-01 will be used
-	ChallengeProvider challenge.Provider
-	// Issue certificates for domains on demand. Otherwise, certs will be
-	// retrieved / issued on start-up.
-	OnDemand bool
-	// Cache is a storage interface. Most ACME libraries have an cache, but
-	// there's no defined interface, so if you consume this option
-	// sanity check it before using.
-	Cache interface{}
-}
-
-// AcceptToS indicates whether you accept your CA's terms of service
-func AcceptToS(b bool) Option {
-	return func(o *Options) {
-		o.AcceptToS = b
-	}
-}
-
-// CA sets the CA of an acme.Options
-func CA(CA string) Option {
-	return func(o *Options) {
-		o.CA = CA
-	}
-}
-
-// ChallengeProvider sets the Challenge provider of an acme.Options
-// if set, it enables the DNS challenge, otherwise tls-alpn-01 will be used.
-func ChallengeProvider(p challenge.Provider) Option {
-	return func(o *Options) {
-		o.ChallengeProvider = p
-	}
-}
-
-// OnDemand enables on-demand certificate issuance. Not recommended for use
-// with the DNS challenge, as the first connection may be very slow.
-func OnDemand(b bool) Option {
-	return func(o *Options) {
-		o.OnDemand = b
-	}
-}
-
-// Cache provides a cache / storage interface to the underlying ACME library
-// as there is no standard, this needs to be validated by the underlying
-// implementation
-func Cache(c interface{}) Option {
-	return func(o *Options) {
-		o.Cache = c
-	}
-}
-
-// DefaultOptions uses the Let's Encrypt Production CA, with DNS Challenge disabled.
-func DefaultOptions() Options {
-	return Options{
-		AcceptToS: true,
-		CA:        LetsEncryptProductionCA,
-		OnDemand:  true,
-	}
-}

api/server/cors/cors.go

@@ -1,44 +0,0 @@
-package cors
-
-import (
-	"net/http"
-)
-
-// CombinedCORSHandler wraps a server and provides CORS headers
-func CombinedCORSHandler(h http.Handler) http.Handler {
-	return corsHandler{h}
-}
-
-type corsHandler struct {
-	handler http.Handler
-}
-
-func (c corsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	SetHeaders(w, r)
-
-	if r.Method == "OPTIONS" {
-		return
-	}
-
-	c.handler.ServeHTTP(w, r)
-}
-
-// SetHeaders sets the CORS headers
-func SetHeaders(w http.ResponseWriter, r *http.Request) {
-	set := func(w http.ResponseWriter, k, v string) {
-		if v := w.Header().Get(k); len(v) > 0 {
-			return
-		}
-		w.Header().Set(k, v)
-	}
-
-	if origin := r.Header.Get("Origin"); len(origin) > 0 {
-		set(w, "Access-Control-Allow-Origin", origin)
-	} else {
-		set(w, "Access-Control-Allow-Origin", "*")
-	}
-
-	set(w, "Access-Control-Allow-Credentials", "true")
-	set(w, "Access-Control-Allow-Methods", "POST, PATCH, GET, OPTIONS, PUT, DELETE")
-	set(w, "Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
-}

api/server/http/http.go

@@ -1,110 +0,0 @@
-// Package http provides a http server with features; acme, cors, etc
-package http
-
-import (
-	"crypto/tls"
-	"net"
-	"net/http"
-	"sync"
-
-	"github.com/unistack-org/micro/v3/api/server"
-	"github.com/unistack-org/micro/v3/logger"
-)
-
-type httpServer struct {
-	mux  *http.ServeMux
-	opts server.Options
-
-	sync.RWMutex
-	address string
-	exit    chan chan error
-}
-
-func NewServer(address string, opts ...server.Option) server.Server {
-	return &httpServer{
-		opts:    server.NewOptions(opts...),
-		mux:     http.NewServeMux(),
-		address: address,
-		exit:    make(chan chan error),
-	}
-}
-
-func (s *httpServer) Address() string {
-	s.RLock()
-	defer s.RUnlock()
-	return s.address
-}
-
-func (s *httpServer) Init(opts ...server.Option) error {
-	for _, o := range opts {
-		o(&s.opts)
-	}
-	return nil
-}
-
-func (s *httpServer) Handle(path string, handler http.Handler) {
-	// TODO: move this stuff out to one place with ServeHTTP
-
-	// apply the wrappers, e.g. auth
-	for _, wrapper := range s.opts.Wrappers {
-		handler = wrapper(handler)
-	}
-
-	s.mux.Handle(path, handler)
-}
-
-func (s *httpServer) Start() error {
-	var l net.Listener
-	var err error
-
-	s.RLock()
-	config := s.opts
-	s.RUnlock()
-	if s.opts.EnableACME && s.opts.ACMEProvider != nil {
-		// should we check the address to make sure its using :443?
-		l, err = s.opts.ACMEProvider.Listen(s.opts.ACMEHosts...)
-	} else if s.opts.EnableTLS && s.opts.TLSConfig != nil {
-		l, err = tls.Listen("tcp", s.address, s.opts.TLSConfig)
-	} else {
-		// otherwise plain listen
-		l, err = net.Listen("tcp", s.address)
-	}
-	if err != nil {
-		return err
-	}
-
-	if config.Logger.V(logger.InfoLevel) {
-		config.Logger.Info("HTTP API Listening on %s", l.Addr().String())
-	}
-
-	s.Lock()
-	s.address = l.Addr().String()
-	s.Unlock()
-
-	go func() {
-		if err := http.Serve(l, s.mux); err != nil {
-			// temporary fix
-			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Error("serve err: %v", err)
-			}
-			s.Stop()
-		}
-	}()
-
-	go func() {
-		ch := <-s.exit
-		ch <- l.Close()
-	}()
-
-	return nil
-}
-
-func (s *httpServer) Stop() error {
-	ch := make(chan error)
-	s.exit <- ch
-	return <-ch
-}
-
-func (s *httpServer) String() string {
-	return "http"
-}

api/server/http/http_test.go

@@ -1,41 +0,0 @@
-package http
-
-import (
-	"fmt"
-	"io/ioutil"
-	"net/http"
-	"testing"
-)
-
-func TestHTTPServer(t *testing.T) {
-	testResponse := "hello world"
-
-	s := NewServer("localhost:0")
-
-	s.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		fmt.Fprint(w, testResponse)
-	}))
-
-	if err := s.Start(); err != nil {
-		t.Fatal(err)
-	}
-
-	rsp, err := http.Get(fmt.Sprintf("http://%s/", s.Address()))
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer rsp.Body.Close()
-
-	b, err := ioutil.ReadAll(rsp.Body)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if string(b) != testResponse {
-		t.Fatalf("Unexpected response, got %s, expected %s", string(b), testResponse)
-	}
-
-	if err := s.Stop(); err != nil {
-		t.Fatal(err)
-	}
-}

api/server/options.go

@@ -1,93 +0,0 @@
-package server
-
-import (
-	"crypto/tls"
-	"net/http"
-
-	"github.com/unistack-org/micro/v3/api/resolver"
-	"github.com/unistack-org/micro/v3/api/server/acme"
-	"github.com/unistack-org/micro/v3/logger"
-)
-
-// Option func
-type Option func(o *Options)
-
-// Options for api server
-type Options struct {
-	EnableACME   bool
-	EnableCORS   bool
-	ACMEProvider acme.Provider
-	EnableTLS    bool
-	ACMEHosts    []string
-	TLSConfig    *tls.Config
-	Resolver     resolver.Resolver
-	Wrappers     []Wrapper
-	Logger       logger.Logger
-}
-
-// NewOptions returns new Options
-func NewOptions(opts ...Option) Options {
-	options := Options{
-		Logger: logger.DefaultLogger,
-	}
-	for _, o := range opts {
-		o(&options)
-	}
-	return options
-}
-
-type Wrapper func(h http.Handler) http.Handler
-
-func WrapHandler(w ...Wrapper) Option {
-	return func(o *Options) {
-		o.Wrappers = append(o.Wrappers, w...)
-	}
-}
-
-func EnableCORS(b bool) Option {
-	return func(o *Options) {
-		o.EnableCORS = b
-	}
-}
-
-func EnableACME(b bool) Option {
-	return func(o *Options) {
-		o.EnableACME = b
-	}
-}
-
-func ACMEHosts(hosts ...string) Option {
-	return func(o *Options) {
-		o.ACMEHosts = hosts
-	}
-}
-
-func ACMEProvider(p acme.Provider) Option {
-	return func(o *Options) {
-		o.ACMEProvider = p
-	}
-}
-
-func EnableTLS(b bool) Option {
-	return func(o *Options) {
-		o.EnableTLS = b
-	}
-}
-
-func TLSConfig(t *tls.Config) Option {
-	return func(o *Options) {
-		o.TLSConfig = t
-	}
-}
-
-func Resolver(r resolver.Resolver) Option {
-	return func(o *Options) {
-		o.Resolver = r
-	}
-}
-
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}

api/server/server.go

@@ -1,15 +0,0 @@
-// Package server provides an API gateway server which handles inbound requests
-package server
-
-import (
-	"net/http"
-)
-
-// Server serves api requests
-type Server interface {
-	Address() string
-	Init(opts ...Option) error
-	Handle(path string, handler http.Handler)
-	Start() error
-	Stop() error
-}

auth/auth.go

@@ -5,6 +5,8 @@ import (
 	"context"
 	"errors"
 	"time"
+
+	"github.com/unistack-org/micro/v3/metadata"
 )
 
 const (
@@ -17,7 +19,7 @@ const (
 )
 
 var (
-	DefaultAuth Auth = &NoopAuth{opts: NewOptions()}
+	DefaultAuth Auth = NewAuth()
 	// ErrInvalidToken is when the token provided is not valid
 	ErrInvalidToken = errors.New("invalid token provided")
 	// ErrForbidden is when a user does not have the necessary scope to access a resource
@@ -57,7 +59,7 @@ type Account struct {
 	// Issuer of the account
 	Issuer string `json:"issuer"`
 	// Any other associated metadata
-	Metadata map[string]string `json:"metadata"`
+	Metadata metadata.Metadata `json:"metadata"`
 	// Scopes the account has access to
 	Scopes []string `json:"scopes"`
 	// Secret for the account, e.g. the password
@@ -124,11 +126,17 @@ type accountKey struct{}
 // is not set, a nil account will be returned. The error is only returned
 // when there was a problem retrieving an account
 func AccountFromContext(ctx context.Context) (*Account, bool) {
+	if ctx == nil {
+		return nil, false
+	}
 	acc, ok := ctx.Value(accountKey{}).(*Account)
 	return acc, ok
 }
 
 // ContextWithAccount sets the account in the context
 func ContextWithAccount(ctx context.Context, account *Account) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
 	return context.WithValue(ctx, accountKey{}, account)
 }

auth/noop.go

@@ -4,29 +4,29 @@ import (
 	"github.com/google/uuid"
 )
 
-type NoopAuth struct {
+type noopAuth struct {
 	opts Options
 }
 
 // String returns the name of the implementation
-func (n *NoopAuth) String() string {
+func (n *noopAuth) String() string {
 	return "noop"
 }
 
 // Init the auth
-func (n *NoopAuth) Init(opts ...Option) {
+func (n *noopAuth) Init(opts ...Option) {
 	for _, o := range opts {
 		o(&n.opts)
 	}
 }
 
 // Options set for auth
-func (n *NoopAuth) Options() Options {
+func (n *noopAuth) Options() Options {
 	return n.opts
 }
 
 // Generate a new account
-func (n *NoopAuth) Generate(id string, opts ...GenerateOption) (*Account, error) {
+func (n *noopAuth) Generate(id string, opts ...GenerateOption) (*Account, error) {
 	options := NewGenerateOptions(opts...)
 
 	return &Account{
@@ -39,27 +39,27 @@ func (n *NoopAuth) Generate(id string, opts ...GenerateOption) (*Account, error)
 }
 
 // Grant access to a resource
-func (n *NoopAuth) Grant(rule *Rule) error {
+func (n *noopAuth) Grant(rule *Rule) error {
 	return nil
 }
 
 // Revoke access to a resource
-func (n *NoopAuth) Revoke(rule *Rule) error {
+func (n *noopAuth) Revoke(rule *Rule) error {
 	return nil
 }
 
 // Rules used to verify requests
-func (n *NoopAuth) Rules(opts ...RulesOption) ([]*Rule, error) {
+func (n *noopAuth) Rules(opts ...RulesOption) ([]*Rule, error) {
 	return []*Rule{}, nil
 }
 
 // Verify an account has access to a resource
-func (n *NoopAuth) Verify(acc *Account, res *Resource, opts ...VerifyOption) error {
+func (n *noopAuth) Verify(acc *Account, res *Resource, opts ...VerifyOption) error {
 	return nil
 }
 
 // Inspect a token
-func (n *NoopAuth) Inspect(token string) (*Account, error) {
+func (n *noopAuth) Inspect(token string) (*Account, error) {
 	uid, err := uuid.NewRandom()
 	if err != nil {
 		return nil, err
@@ -68,6 +68,11 @@ func (n *NoopAuth) Inspect(token string) (*Account, error) {
 }
 
 // Token generation using an account id and secret
-func (n *NoopAuth) Token(opts ...TokenOption) (*Token, error) {
+func (n *noopAuth) Token(opts ...TokenOption) (*Token, error) {
 	return &Token{}, nil
 }
+
+// NewAuth returns new noop auth
+func NewAuth(opts ...Option) Auth {
+	return &noopAuth{opts: NewOptions(opts...)}
+}

auth/options.go

@@ -5,11 +5,19 @@ import (
 	"time"
 
 	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/metadata"
+	"github.com/unistack-org/micro/v3/meter"
 	"github.com/unistack-org/micro/v3/store"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
+// NewOptions creates Options struct from slice of options
 func NewOptions(opts ...Option) Options {
-	var options Options
+	options := Options{
+		Tracer: tracer.DefaultTracer,
+		Logger: logger.DefaultLogger,
+		Meter:  meter.DefaultMeter,
+	}
 	for _, o := range opts {
 		o(&options)
 	}
@@ -17,6 +25,7 @@ func NewOptions(opts ...Option) Options {
 }
 
 type Options struct {
+	Name string
 	// Issuer of the service's account
 	Issuer string
 	// ID is the services auth ID
@@ -37,10 +46,15 @@ type Options struct {
 	Addrs []string
 	// Logger sets the logger
 	Logger logger.Logger
+	// Meter sets tht meter
+	Meter meter.Meter
+	// Tracer
+	Tracer tracer.Tracer
 	// Context to store other options
 	Context context.Context
 }
 
+// Option func
 type Option func(o *Options)
 
 // Addrs is the auth addresses to use
@@ -50,6 +64,13 @@ func Addrs(addrs ...string) Option {
 	}
 }
 
+// Name sets the name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}
+
 // Issuer of the services account
 func Issuer(i string) Option {
 	return func(o *Options) {
@@ -100,9 +121,10 @@ func LoginURL(url string) Option {
 	}
 }
 
+// GenerateOptions struct
 type GenerateOptions struct {
 	// Metadata associated with the account
-	Metadata map[string]string
+	Metadata metadata.Metadata
 	// Scopes the account has access too
 	Scopes []string
 	// Provider of the account, e.g. oauth
@@ -115,6 +137,7 @@ type GenerateOptions struct {
 	Issuer string
 }
 
+// GenerateOption func
 type GenerateOption func(o *GenerateOptions)
 
 // WithSecret for the generated account
@@ -132,9 +155,9 @@ func WithType(t string) GenerateOption {
 }
 
 // WithMetadata for the generated account
-func WithMetadata(md map[string]string) GenerateOption {
+func WithMetadata(md metadata.Metadata) GenerateOption {
 	return func(o *GenerateOptions) {
-		o.Metadata = md
+		o.Metadata = metadata.Copy(md)
 	}
 }
 
@@ -168,6 +191,7 @@ func NewGenerateOptions(opts ...GenerateOption) GenerateOptions {
 	return options
 }
 
+// TokenOptions struct
 type TokenOptions struct {
 	// ID for the account
 	ID string
@@ -181,6 +205,7 @@ type TokenOptions struct {
 	Issuer string
 }
 
+// TokenOption func
 type TokenOption func(o *TokenOptions)
 
 // WithExpiry for the token
@@ -190,6 +215,7 @@ func WithExpiry(ex time.Duration) TokenOption {
 	}
 }
 
+// WithCredentials sets tye id and secret
 func WithCredentials(id, secret string) TokenOption {
 	return func(o *TokenOptions) {
 		o.ID = id
@@ -197,12 +223,14 @@ func WithCredentials(id, secret string) TokenOption {
 	}
 }
 
+// WithToken sets the refresh token
 func WithToken(rt string) TokenOption {
 	return func(o *TokenOptions) {
 		o.RefreshToken = rt
 	}
 }
 
+// WithTokenIssuer sets the token issuer option
 func WithTokenIssuer(iss string) TokenOption {
 	return func(o *TokenOptions) {
 		o.Issuer = iss
@@ -224,39 +252,69 @@ func NewTokenOptions(opts ...TokenOption) TokenOptions {
 	return options
 }
 
+// VerifyOptions struct
 type VerifyOptions struct {
 	Context   context.Context
 	Namespace string
 }
 
+// VerifyOption func
 type VerifyOption func(o *VerifyOptions)
 
+// VerifyContext pass context to verify
 func VerifyContext(ctx context.Context) VerifyOption {
 	return func(o *VerifyOptions) {
 		o.Context = ctx
 	}
 }
+
+// VerifyNamespace sets thhe namespace for verify
 func VerifyNamespace(ns string) VerifyOption {
 	return func(o *VerifyOptions) {
 		o.Namespace = ns
 	}
 }
 
+// RulesOptions struct
 type RulesOptions struct {
 	Context   context.Context
 	Namespace string
 }
 
+// RulesOption func
 type RulesOption func(o *RulesOptions)
 
+// RulesContext pass rules context
 func RulesContext(ctx context.Context) RulesOption {
 	return func(o *RulesOptions) {
 		o.Context = ctx
 	}
 }
 
+// RulesNamespace sets the rule namespace
 func RulesNamespace(ns string) RulesOption {
 	return func(o *RulesOptions) {
 		o.Namespace = ns
 	}
 }
+
+// Logger sets the logger
+func Logger(l logger.Logger) Option {
+	return func(o *Options) {
+		o.Logger = l
+	}
+}
+
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// Tracer sets the meter
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}

broker/broker.go

@@ -1,14 +1,20 @@
 // Package broker is an interface used for asynchronous messaging
 package broker
 
-import "context"
+import (
+	"context"
+
+	"github.com/unistack-org/micro/v3/metadata"
+)
 
 var (
+	// DefaultBroker default broker
 	DefaultBroker Broker = NewBroker()
 )
 
 // Broker is an interface used for asynchronous messaging.
 type Broker interface {
+	Name() string
 	Init(...Option) error
 	Options() Options
 	Address() string
@@ -32,7 +38,7 @@ type Event interface {
 
 // Message is used to transfer data
 type Message struct {
-	Header map[string]string // contains message metadata
+	Header metadata.Metadata // contains message metadata
 	Body   []byte            // contains message body
 }
 

broker/context.go

@@ -6,12 +6,20 @@ import (
 
 type brokerKey struct{}
 
+// FromContext returns broker from passed context
 func FromContext(ctx context.Context) (Broker, bool) {
+	if ctx == nil {
+		return nil, false
+	}
 	c, ok := ctx.Value(brokerKey{}).(Broker)
 	return c, ok
 }
 
+// NewContext savess broker in context
 func NewContext(ctx context.Context, s Broker) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
 	return context.WithValue(ctx, brokerKey{}, s)
 }
 

broker/noop.go

@@ -16,6 +16,10 @@ func NewBroker(opts ...Option) Broker {
 	return &noopBroker{opts: NewOptions(opts...)}
 }
 
+func (n *noopBroker) Name() string {
+	return n.opts.Name
+}
+
 // Init initialize broker
 func (n *noopBroker) Init(opts ...Option) error {
 	for _, o := range opts {

broker/options.go

@@ -6,34 +6,43 @@ import (
 
 	"github.com/unistack-org/micro/v3/codec"
 	"github.com/unistack-org/micro/v3/logger"
-	"github.com/unistack-org/micro/v3/registry"
+	"github.com/unistack-org/micro/v3/meter"
+	"github.com/unistack-org/micro/v3/register"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
 // Options struct
 type Options struct {
-	Addrs  []string
-	Secure bool
-	Codec  codec.Marshaler
-
-	// Logger
-	Logger logger.Logger
-	// Handler executed when errors occur processing messages
+	Name string
+	// Addrs useed by broker
+	Addrs []string
+	// ErrorHandler executed when errors occur processing messages
 	ErrorHandler Handler
-
+	// Codec used to marshal/unmarshal messages
+	Codec codec.Codec
+	// Logger the used logger
+	Logger logger.Logger
+	// Meter the used for metrics
+	Meter meter.Meter
+	// Tracer used for trace
+	Tracer tracer.Tracer
+	// TLSConfig for secure communication
 	TLSConfig *tls.Config
-	// Registry used for clustering
-	Registry registry.Registry
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// Register used for clustering
+	Register register.Register
+	// Context is used for non default options
 	Context context.Context
 }
 
 // NewOptions create new Options
 func NewOptions(opts ...Option) Options {
 	options := Options{
-		Registry: registry.DefaultRegistry,
+		Register: register.DefaultRegister,
 		Logger:   logger.DefaultLogger,
 		Context:  context.Background(),
+		Meter:    meter.DefaultMeter,
+		Codec:    codec.DefaultCodec,
+		Tracer:   tracer.DefaultTracer,
 	}
 	for _, o := range opts {
 		o(&options)
@@ -50,8 +59,9 @@ func Context(ctx context.Context) Option {
 
 // PublishOptions struct
 type PublishOptions struct {
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// BodyOnly says that only body of the message must be published
+	BodyOnly bool
+	// Context for non default options
 	Context context.Context
 }
 
@@ -73,16 +83,18 @@ type SubscribeOptions struct {
 	// AutoAck ack messages if handler returns nil err
 	AutoAck bool
 
-	// Handler executed when errors occur processing messages
+	// ErrorHandler executed when errors occur processing messages
 	ErrorHandler Handler
 
-	// Subscribers with the same group name
+	// Group for subscriber, Subscribers with the same group name
 	// will create a shared subscription where each
 	// receives a subset of messages.
 	Group string
 
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// BodyOnly says that consumed only body of the message
+	BodyOnly bool
+
+	// Context is used for non default options
 	Context context.Context
 }
 
@@ -92,6 +104,13 @@ type Option func(*Options)
 // PublishOption func
 type PublishOption func(*PublishOptions)
 
+// PublishBodyOnly publish only body of the message
+func PublishBodyOnly(b bool) PublishOption {
+	return func(o *PublishOptions) {
+		o.BodyOnly = b
+	}
+}
+
 // PublishContext sets the context
 func PublishContext(ctx context.Context) PublishOption {
 	return func(o *PublishOptions) {
@@ -125,7 +144,7 @@ func Addrs(addrs ...string) Option {
 
 // Codec sets the codec used for encoding/decoding used where
 // a broker does not support headers
-func Codec(c codec.Marshaler) Option {
+func Codec(c codec.Codec) Option {
 	return func(o *Options) {
 		o.Codec = c
 	}
@@ -146,6 +165,13 @@ func SubscribeAutoAck(b bool) SubscribeOption {
 	}
 }
 
+// SubscribeBodyOnly consumes only body of the message
+func SubscribeBodyOnly(b bool) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.BodyOnly = b
+	}
+}
+
 // ErrorHandler will catch all broker errors that cant be handled
 // in normal way, for example Codec errors
 func ErrorHandler(h Handler) Option {
@@ -162,7 +188,8 @@ func SubscribeErrorHandler(h Handler) SubscribeOption {
 	}
 }
 
-// Queue sets the subscribers sueue
+// Queue sets the subscribers queue
+// Deprecated
 func Queue(name string) SubscribeOption {
 	return func(o *SubscribeOptions) {
 		o.Group = name
@@ -176,17 +203,10 @@ func SubscribeGroup(name string) SubscribeOption {
 	}
 }
 
-// Registry sets registry option
-func Registry(r registry.Registry) Option {
+// Register sets register option
+func Register(r register.Register) Option {
 	return func(o *Options) {
-		o.Registry = r
-	}
-}
-
-// Secure communication with the broker
-func Secure(b bool) Option {
-	return func(o *Options) {
-		o.Secure = b
+		o.Register = r
 	}
 }
 
@@ -204,6 +224,27 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// Name sets the name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}
+
 // SubscribeContext set context
 func SubscribeContext(ctx context.Context) SubscribeOption {
 	return func(o *SubscribeOptions) {

client/client.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"github.com/unistack-org/micro/v3/codec"
+	"github.com/unistack-org/micro/v3/metadata"
 )
 
 var (
@@ -17,6 +18,7 @@ var (
 // It supports Request/Response via Transport and Publishing via the Broker.
 // It also supports bidirectional streaming of requests.
 type Client interface {
+	Name() string
 	Init(...Option) error
 	Options() Options
 	NewMessage(topic string, msg interface{}, opts ...MessageOption) Message
@@ -47,7 +49,7 @@ type Request interface {
 	// The unencoded request body
 	Body() interface{}
 	// Write to the encoded request writer. This is nil before a call is made
-	Codec() codec.Writer
+	Codec() codec.Codec
 	// indicates whether the request will be a streaming one rather than unary
 	Stream() bool
 }
@@ -55,9 +57,9 @@ type Request interface {
 // Response is the response received from a service
 type Response interface {
 	// Read the response
-	Codec() codec.Reader
+	Codec() codec.Codec
 	// read the header
-	Header() map[string]string
+	Header() metadata.Metadata
 	// Read the undecoded response
 	Read() ([]byte, error)
 }
@@ -99,9 +101,9 @@ var (
 	// DefaultBackoff is the default backoff function for retries
 	DefaultBackoff = exponentialBackoff
 	// DefaultRetry is the default check-for-retry function for retries
-	DefaultRetry = RetryOnError
+	DefaultRetry = RetryNever
 	// DefaultRetries is the default number of times a request is tried
-	DefaultRetries = 1
+	DefaultRetries = 0
 	// DefaultRequestTimeout is the default request timeout
 	DefaultRequestTimeout = time.Second * 5
 	// DefaultPoolSize sets the connection pool size

client/client_call_options.go

@@ -0,0 +1,23 @@
+package client
+
+import (
+	"context"
+)
+
+type clientCallOptions struct {
+	Client
+	opts []CallOption
+}
+
+func (s *clientCallOptions) Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error {
+	return s.Client.Call(ctx, req, rsp, append(s.opts, opts...)...)
+}
+
+func (s *clientCallOptions) Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
+	return s.Client.Stream(ctx, req, append(s.opts, opts...)...)
+}
+
+// NewClientCallOptions add CallOption to every call
+func NewClientCallOptions(c Client, opts ...CallOption) Client {
+	return &clientCallOptions{c, opts}
+}

client/context.go

@@ -6,12 +6,20 @@ import (
 
 type clientKey struct{}
 
+// FromContext get client from context
 func FromContext(ctx context.Context) (Client, bool) {
+	if ctx == nil {
+		return nil, false
+	}
 	c, ok := ctx.Value(clientKey{}).(Client)
 	return c, ok
 }
 
+// NewContext put client in context
 func NewContext(ctx context.Context, c Client) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
 	return context.WithValue(ctx, clientKey{}, c)
 }
 
@@ -24,3 +32,23 @@ func SetPublishOption(k, v interface{}) PublishOption {
 		o.Context = context.WithValue(o.Context, k, v)
 	}
 }
+
+// SetCallOption returns a function to setup a context with given value
+func SetCallOption(k, v interface{}) CallOption {
+	return func(o *CallOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetOption returns a function to setup a context with given value
+func SetOption(k, v interface{}) Option {
+	return func(o *Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

client/lookup.go

@@ -18,6 +18,10 @@ func LookupRoute(ctx context.Context, req Request, opts CallOptions) ([]string,
 		return opts.Address, nil
 	}
 
+	if opts.Router == nil {
+		return nil, router.ErrRouteNotFound
+	}
+
 	// construct the router query
 	query := []router.QueryOption{router.QueryService(req.Service())}
 

client/noop.go

@@ -3,14 +3,27 @@ package client
 import (
 	"context"
 
-	raw "github.com/unistack-org/micro-codec-bytes"
-	json "github.com/unistack-org/micro-codec-json"
 	"github.com/unistack-org/micro/v3/broker"
 	"github.com/unistack-org/micro/v3/codec"
 	"github.com/unistack-org/micro/v3/errors"
 	"github.com/unistack-org/micro/v3/metadata"
 )
 
+var (
+	// DefaultCodecs will be used to encode/decode data
+	DefaultCodecs = map[string]codec.Codec{
+		//"application/json":         cjson.NewCodec,
+		//"application/json-rpc":     cjsonrpc.NewCodec,
+		//"application/protobuf":     cproto.NewCodec,
+		//"application/proto-rpc":    cprotorpc.NewCodec,
+		"application/octet-stream": codec.NewCodec(),
+	}
+)
+
+const (
+	defaultContentType = "application/json"
+)
+
 type noopClient struct {
 	opts Options
 }
@@ -27,7 +40,7 @@ type noopRequest struct {
 	endpoint    string
 	contentType string
 	body        interface{}
-	codec       codec.Writer
+	codec       codec.Codec
 	stream      bool
 }
 
@@ -36,6 +49,10 @@ func NewClient(opts ...Option) Client {
 	return &noopClient{opts: NewOptions(opts...)}
 }
 
+func (n *noopClient) Name() string {
+	return n.opts.Name
+}
+
 func (n *noopRequest) Service() string {
 	return n.service
 }
@@ -56,7 +73,7 @@ func (n *noopRequest) Body() interface{} {
 	return n.body
 }
 
-func (n *noopRequest) Codec() codec.Writer {
+func (n *noopRequest) Codec() codec.Codec {
 	return n.codec
 }
 
@@ -65,15 +82,15 @@ func (n *noopRequest) Stream() bool {
 }
 
 type noopResponse struct {
-	codec  codec.Reader
-	header map[string]string
+	codec  codec.Codec
+	header metadata.Metadata
 }
 
-func (n *noopResponse) Codec() codec.Reader {
+func (n *noopResponse) Codec() codec.Codec {
 	return n.codec
 }
 
-func (n *noopResponse) Header() map[string]string {
+func (n *noopResponse) Header() metadata.Metadata {
 	return n.header
 }
 
@@ -123,6 +140,16 @@ func (n *noopMessage) ContentType() string {
 	return n.opts.ContentType
 }
 
+func (n *noopClient) newCodec(contentType string) (codec.Codec, error) {
+	if cf, ok := n.opts.Codecs[contentType]; ok {
+		return cf, nil
+	}
+	if cf, ok := DefaultCodecs[contentType]; ok {
+		return cf, nil
+	}
+	return nil, codec.ErrUnknownContentType
+}
+
 func (n *noopClient) Init(opts ...Option) error {
 	for _, o := range opts {
 		o(&n.opts)
@@ -168,21 +195,15 @@ func (n *noopClient) Publish(ctx context.Context, p Message, opts ...PublishOpti
 	md["Micro-Topic"] = p.Topic()
 
 	// passed in raw data
-	if d, ok := p.Payload().(*raw.Frame); ok {
+	if d, ok := p.Payload().(*codec.Frame); ok {
 		body = d.Data
 	} else {
-		cf := n.opts.Broker.Options().Codec
-		if cf == nil {
-			cf = json.Marshaler{}
+		// use codec for payload
+		cf, err := n.newCodec(p.ContentType())
+		if err != nil {
+			return errors.InternalServerError("go.micro.client", err.Error())
 		}
 
-		/*
-			// use codec for payload
-			cf, err := n.opts.Codecs[p.ContentType()]
-			if err != nil {
-				return errors.InternalServerError("go.micro.client", err.Error())
-			}
-		*/
 		// set the body
 		b, err := cf.Marshal(p.Payload())
 		if err != nil {

client/options.go

@@ -7,14 +7,18 @@ import (
 	"github.com/unistack-org/micro/v3/broker"
 	"github.com/unistack-org/micro/v3/codec"
 	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/meter"
 	"github.com/unistack-org/micro/v3/network/transport"
-	"github.com/unistack-org/micro/v3/registry"
+	"github.com/unistack-org/micro/v3/register"
 	"github.com/unistack-org/micro/v3/router"
 	"github.com/unistack-org/micro/v3/selector"
 	"github.com/unistack-org/micro/v3/selector/random"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
+// Options holds client options
 type Options struct {
+	Name string
 	// Used to select codec
 	ContentType string
 	// Proxy address to send requests via
@@ -22,29 +26,30 @@ type Options struct {
 
 	// Plugged interfaces
 	Broker    broker.Broker
-	Codecs    map[string]codec.NewCodec
+	Codecs    map[string]codec.Codec
 	Router    router.Router
 	Selector  selector.Selector
 	Transport transport.Transport
 	Logger    logger.Logger
+	Meter     meter.Meter
 	// Lookup used for looking up routes
 	Lookup LookupFunc
 
 	// Connection Pool
 	PoolSize int
 	PoolTTL  time.Duration
-
-	// Middleware for client
+	Tracer   tracer.Tracer
+	// Wrapper that used client
 	Wrappers []Wrapper
 
-	// Default Call Options
+	// CallOptions that used by default
 	CallOptions CallOptions
 
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// Context is used for non default options
 	Context context.Context
 }
 
+// NewCallOptions creates new call options struct
 func NewCallOptions(opts ...CallOption) CallOptions {
 	options := CallOptions{}
 	for _, o := range opts {
@@ -53,6 +58,7 @@ func NewCallOptions(opts ...CallOption) CallOptions {
 	return options
 }
 
+// CallOptions holds client call options
 type CallOptions struct {
 	// Address of remote hosts
 	Address []string
@@ -78,21 +84,20 @@ type CallOptions struct {
 	AuthToken bool
 	// Network to lookup the route within
 	Network string
-
 	// Middleware for low level call func
 	CallWrappers []CallWrapper
-
-	// Other options for implementations of the interface
-	// can be stored in a context
+	// Context is uded for non default options
 	Context context.Context
 }
 
+// Context pass context to client
 func Context(ctx context.Context) Option {
 	return func(o *Options) {
 		o.Context = ctx
 	}
 }
 
+// NewPublishOptions create new PublishOptions struct from option
 func NewPublishOptions(opts ...PublishOption) PublishOptions {
 	options := PublishOptions{}
 	for _, o := range opts {
@@ -101,6 +106,7 @@ func NewPublishOptions(opts ...PublishOption) PublishOptions {
 	return options
 }
 
+// PublishOptions holds publish options
 type PublishOptions struct {
 	// Exchange is the routing exchange for the message
 	Exchange string
@@ -109,6 +115,7 @@ type PublishOptions struct {
 	Context context.Context
 }
 
+// NewMessageOptions creates message options struct
 func NewMessageOptions(opts ...MessageOption) MessageOptions {
 	options := MessageOptions{}
 	for _, o := range opts {
@@ -117,10 +124,12 @@ func NewMessageOptions(opts ...MessageOption) MessageOptions {
 	return options
 }
 
+// MessageOptions holds client message options
 type MessageOptions struct {
 	ContentType string
 }
 
+// NewRequestOptions creates new RequestOptions struct
 func NewRequestOptions(opts ...RequestOption) RequestOptions {
 	options := RequestOptions{}
 	for _, o := range opts {
@@ -129,20 +138,21 @@ func NewRequestOptions(opts ...RequestOption) RequestOptions {
 	return options
 }
 
+// RequestOptions holds client request options
 type RequestOptions struct {
 	ContentType string
 	Stream      bool
-
 	// Other options for implementations of the interface
 	// can be stored in a context
 	Context context.Context
 }
 
+// NewOptions creates new options struct
 func NewOptions(opts ...Option) Options {
 	options := Options{
 		Context:     context.Background(),
-		ContentType: "application/protobuf",
-		Codecs:      make(map[string]codec.NewCodec),
+		ContentType: "application/json",
+		Codecs:      make(map[string]codec.Codec),
 		CallOptions: CallOptions{
 			Backoff:        DefaultBackoff,
 			Retry:          DefaultRetry,
@@ -156,6 +166,8 @@ func NewOptions(opts ...Option) Options {
 		Selector: random.NewSelector(),
 		Logger:   logger.DefaultLogger,
 		Broker:   broker.DefaultBroker,
+		Meter:    meter.DefaultMeter,
+		Tracer:   tracer.DefaultTracer,
 	}
 
 	for _, o := range opts {
@@ -172,14 +184,29 @@ func Broker(b broker.Broker) Option {
 	}
 }
 
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
+// Logger to be used for log mesages
 func Logger(l logger.Logger) Option {
 	return func(o *Options) {
 		o.Logger = l
 	}
 }
 
+// Meter to be used for metrics
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
 // Codec to be used to encode/decode requests for a given content type
-func Codec(contentType string, c codec.NewCodec) Option {
+func Codec(contentType string, c codec.Codec) Option {
 	return func(o *Options) {
 		o.Codecs[contentType] = c
 	}
@@ -220,11 +247,11 @@ func Transport(t transport.Transport) Option {
 	}
 }
 
-// Registry sets the routers registry
-func Registry(r registry.Registry) Option {
+// Register sets the routers register
+func Register(r register.Register) Option {
 	return func(o *Options) {
 		if o.Router != nil {
-			o.Router.Init(router.Registry(r))
+			o.Router.Init(router.Register(r))
 		}
 	}
 }
@@ -265,6 +292,13 @@ func Backoff(fn BackoffFunc) Option {
 	}
 }
 
+// Name sets the client name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}
+
 // Lookup sets the lookup function to use for resolving service names
 func Lookup(l LookupFunc) Option {
 	return func(o *Options) {
@@ -272,7 +306,7 @@ func Lookup(l LookupFunc) Option {
 	}
 }
 
-// Number of retries when making the request.
+// Retries sets the retry count when making the request.
 // Should this be a Call Option?
 func Retries(i int) Option {
 	return func(o *Options) {
@@ -287,7 +321,7 @@ func Retry(fn RetryFunc) Option {
 	}
 }
 
-// The request timeout.
+// RequestTimeout is the request timeout.
 // Should this be a Call Option?
 func RequestTimeout(d time.Duration) Option {
 	return func(o *Options) {
@@ -422,6 +456,7 @@ func WithSelectOptions(sops ...selector.SelectOption) CallOption {
 	}
 }
 
+// WithMessageContentType sets the message content type
 func WithMessageContentType(ct string) MessageOption {
 	return func(o *MessageOptions) {
 		o.ContentType = ct
@@ -430,12 +465,14 @@ func WithMessageContentType(ct string) MessageOption {
 
 // Request Options
 
+// WithContentType specifies request content type
 func WithContentType(ct string) RequestOption {
 	return func(o *RequestOptions) {
 		o.ContentType = ct
 	}
 }
 
+// StreamingRequest specifies that request is streaming
 func StreamingRequest() RequestOption {
 	return func(o *RequestOptions) {
 		o.Stream = true

client/retry.go

@@ -14,22 +14,23 @@ func RetryAlways(ctx context.Context, req Request, retryCount int, err error) (b
 	return true, nil
 }
 
+// RetryNever never retry on error
+func RetryNever(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
+	return false, nil
+}
+
 // RetryOnError retries a request on a 500 or timeout error
 func RetryOnError(ctx context.Context, req Request, retryCount int, err error) (bool, error) {
 	if err == nil {
 		return false, nil
 	}
 
-	e := errors.Parse(err.Error())
-	if e == nil {
-		return false, nil
-	}
-
-	switch e.Code {
+	me := errors.FromError(err)
+	switch me.Code {
 	// retry on timeout or internal server error
 	case 408, 500:
 		return true, nil
-	default:
-		return false, nil
 	}
+
+	return false, nil
 }

client/test_request.go

@@ -34,7 +34,7 @@ func (r *testRequest) Body() interface{} {
 	return r.body
 }
 
-func (r *testRequest) Codec() codec.Writer {
+func (r *testRequest) Codec() codec.Codec {
 	return r.codec
 }
 

cmd/protoc-gen-micro/.gitignore

@@ -1,33 +0,0 @@
-# Compiled Object files, Static and Dynamic libs (Shared Objects)
-*.o
-*.a
-*.so
-
-# Folders
-_obj
-_test
-_build
-
-# Architecture specific extensions/prefixes
-*.[568vq]
-[568vq].out
-
-*.cgo1.go
-*.cgo2.c
-_cgo_defun.c
-_cgo_gotypes.go
-_cgo_export.*
-
-_testmain.go
-
-*.exe
-*.test
-*.prof
-
-# ignore go build and test outputs
-coverage.txt
-coverage.out
-
-# ignore locally built binaries
-protoc-gen-micro
-dist

cmd/protoc-gen-micro/README.md

@@ -1,138 +0,0 @@
-# protoc-gen-micro
-
-This is protobuf code generation for micro. We use protoc-gen-micro to reduce boilerplate code.
-
-## Install
-
-```
-go get github.com/micro/micro/v3/cmd/protoc-gen-micro@master
-```
-
-Also required: 
-
-- [protoc](https://github.com/google/protobuf)
-- [protoc-gen-go](https://github.com/golang/protobuf)
-
-## Usage
-
-Define your service as `greeter.proto`
-
-```
-syntax = "proto3";
-
-service Greeter {
-	rpc Hello(Request) returns (Response) {}
-}
-
-message Request {
-	string name = 1;
-}
-
-message Response {
-	string msg = 1;
-}
-```
-
-Generate the code
-
-```
-protoc --proto_path=$GOPATH/src:. --micro_out=. --go_out=. greeter.proto
-```
-
-Your output result should be:
-
-```
-./
-    greeter.proto	# original protobuf file
-    greeter.pb.go	# auto-generated by protoc-gen-go
-    greeter.micro.go	# auto-generated by protoc-gen-micro
-```
-
-The micro generated code includes clients and handlers which reduce boiler plate code
-
-### Server
-
-Register the handler with your micro server
-
-```go
-type Greeter struct{}
-
-func (g *Greeter) Hello(ctx context.Context, req *proto.Request, rsp *proto.Response) error {
-	rsp.Msg = "Hello " + req.Name
-	return nil
-}
-
-proto.RegisterGreeterHandler(service.Server(), &Greeter{})
-```
-
-### Client
-
-Create a service client with your micro client
-
-```go
-client := proto.NewGreeterService("greeter", service.Client())
-```
-
-### Errors
-
-If you see an error about `protoc-gen-micro` not being found or executable, it's likely your environment may not be configured correctly. If you've already installed `protoc`, `protoc-gen-go`, and `protoc-gen-micro` ensure you've included `$GOPATH/bin` in your `PATH`.
-
-Alternative specify the Go plugin paths as arguments to the `protoc` command
-
-```
-protoc --plugin=protoc-gen-go=$GOPATH/bin/protoc-gen-go --plugin=protoc-gen-micro=$GOPATH/bin/protoc-gen-micro --proto_path=$GOPATH/src:. --micro_out=. --go_out=. greeter.proto
-```
-
-### Endpoint
-
-Add a micro API endpoint which routes directly to an RPC method
-
-Usage:
-
-1. Clone `github.com/googleapis/googleapis` to use this feature as it requires http annotations.
-2. The protoc command must include `-I$GOPATH/src/github.com/googleapis/googleapis` for the annotations import.
-
-```diff
-syntax = "proto3";
-
-import "google/api/annotations.proto";
-
-service Greeter {
-	rpc Hello(Request) returns (Response) {
-		option (google.api.http) = { post: "/hello"; body: "*"; };
-	}
-}
-
-message Request {
-	string name = 1;
-}
-
-message Response {
-	string msg = 1;
-}
-```
-
-The proto generates a `RegisterGreeterHandler` function with a [api.Endpoint](https://godoc.org/github.com/micro/go-micro/api#Endpoint). 
-
-```diff
-func RegisterGreeterHandler(s server.Server, hdlr GreeterHandler, opts ...server.HandlerOption) error {
-	type greeter interface {
-		Hello(ctx context.Context, in *Request, out *Response) error
-	}
-	type Greeter struct {
-		greeter
-	}
-	h := &greeterHandler{hdlr}
-	opts = append(opts, api.WithEndpoint(&api.Endpoint{
-		Name:    "Greeter.Hello",
-		Path:    []string{"/hello"},
-		Method:  []string{"POST"},
-		Handler: "rpc",
-	}))
-	return s.Handle(s.NewHandler(&Greeter{h}, opts...))
-}
-```
-
-## LICENSE
-
-protoc-gen-micro is a liberal reuse of protoc-gen-go hence we maintain the original license 

cmd/protoc-gen-micro/generator/Makefile

@@ -1,40 +0,0 @@
-# Go support for Protocol Buffers - Google's data interchange format
-#
-# Copyright 2010 The Go Authors.  All rights reserved.
-# https://github.com/golang/protobuf
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-include $(GOROOT)/src/Make.inc
-
-TARG=github.com/golang/protobuf/compiler/generator
-GOFILES=\
-	generator.go\
-
-DEPS=../descriptor ../plugin ../../proto
-
-include $(GOROOT)/src/Make.pkg

cmd/protoc-gen-micro/generator/name_test.go

@@ -1,135 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2013 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package generator
-
-import (
-	"testing"
-
-	"github.com/golang/protobuf/protoc-gen-go/descriptor"
-)
-
-func TestCamelCase(t *testing.T) {
-	tests := []struct {
-		in, want string
-	}{
-		{"one", "One"},
-		{"one_two", "OneTwo"},
-		{"_my_field_name_2", "XMyFieldName_2"},
-		{"Something_Capped", "Something_Capped"},
-		{"my_Name", "My_Name"},
-		{"OneTwo", "OneTwo"},
-		{"_", "X"},
-		{"_a_", "XA_"},
-	}
-	for _, tc := range tests {
-		if got := CamelCase(tc.in); got != tc.want {
-			t.Errorf("CamelCase(%q) = %q, want %q", tc.in, got, tc.want)
-		}
-	}
-}
-
-func TestGoPackageOption(t *testing.T) {
-	tests := []struct {
-		in      string
-		impPath GoImportPath
-		pkg     GoPackageName
-		ok      bool
-	}{
-		{"", "", "", false},
-		{"foo", "", "foo", true},
-		{"github.com/golang/bar", "github.com/golang/bar", "bar", true},
-		{"github.com/golang/bar;baz", "github.com/golang/bar", "baz", true},
-		{"github.com/golang/string", "github.com/golang/string", "string", true},
-	}
-	for _, tc := range tests {
-		d := &FileDescriptor{
-			FileDescriptorProto: &descriptor.FileDescriptorProto{
-				Options: &descriptor.FileOptions{
-					GoPackage: &tc.in,
-				},
-			},
-		}
-		impPath, pkg, ok := d.goPackageOption()
-		if impPath != tc.impPath || pkg != tc.pkg || ok != tc.ok {
-			t.Errorf("go_package = %q => (%q, %q, %t), want (%q, %q, %t)", tc.in,
-				impPath, pkg, ok, tc.impPath, tc.pkg, tc.ok)
-		}
-	}
-}
-
-func TestPackageNames(t *testing.T) {
-	g := New()
-	g.packageNames = make(map[GoImportPath]GoPackageName)
-	g.usedPackageNames = make(map[GoPackageName]bool)
-	for _, test := range []struct {
-		importPath GoImportPath
-		want       GoPackageName
-	}{
-		{"github.com/golang/foo", "foo"},
-		{"github.com/golang/second/package/named/foo", "foo1"},
-		{"github.com/golang/third/package/named/foo", "foo2"},
-		{"github.com/golang/conflicts/with/predeclared/ident/string", "string1"},
-	} {
-		if got := g.GoPackageName(test.importPath); got != test.want {
-			t.Errorf("GoPackageName(%v) = %v, want %v", test.importPath, got, test.want)
-		}
-	}
-}
-
-func TestUnescape(t *testing.T) {
-	tests := []struct {
-		in  string
-		out string
-	}{
-		// successful cases, including all kinds of escapes
-		{"", ""},
-		{"foo bar baz frob nitz", "foo bar baz frob nitz"},
-		{`\000\001\002\003\004\005\006\007`, string([]byte{0, 1, 2, 3, 4, 5, 6, 7})},
-		{`\a\b\f\n\r\t\v\\\?\'\"`, string([]byte{'\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\', '?', '\'', '"'})},
-		{`\x10\x20\x30\x40\x50\x60\x70\x80`, string([]byte{16, 32, 48, 64, 80, 96, 112, 128})},
-		// variable length octal escapes
-		{`\0\018\222\377\3\04\005\6\07`, string([]byte{0, 1, '8', 0222, 255, 3, 4, 5, 6, 7})},
-		// malformed escape sequences left as is
-		{"foo \\g bar", "foo \\g bar"},
-		{"foo \\xg0 bar", "foo \\xg0 bar"},
-		{"\\", "\\"},
-		{"\\x", "\\x"},
-		{"\\xf", "\\xf"},
-		{"\\777", "\\777"}, // overflows byte
-	}
-	for _, tc := range tests {
-		s := unescape(tc.in)
-		if s != tc.out {
-			t.Errorf("doUnescape(%q) = %q; should have been %q", tc.in, s, tc.out)
-		}
-	}
-}

cmd/protoc-gen-micro/main.go

@@ -1,99 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2010 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// protoc-gen-micro is a plugin for the Google protocol buffer compiler to generate
-// Go code.  Run it by building this program and putting it in your path with
-// the name
-// 	protoc-gen-micro
-// That word 'micro' at the end becomes part of the option string set for the
-// protocol compiler, so once the protocol compiler (protoc) is installed
-// you can run
-// 	protoc --micro_out=output_directory --go_out=output_directory input_directory/file.proto
-// to generate go-micro code for the protocol defined by file.proto.
-// With that input, the output will be written to
-// 	output_directory/file.micro.go
-//
-// The generated code is documented in the package comment for
-// the library.
-//
-// See the README and documentation for protocol buffers to learn more:
-// 	https://developers.google.com/protocol-buffers/
-package main
-
-import (
-	"io/ioutil"
-	"os"
-
-	"github.com/golang/protobuf/proto"
-	"github.com/unistack-org/micro/v3/cmd/protoc-gen-micro/generator"
-	_ "github.com/unistack-org/micro/v3/cmd/protoc-gen-micro/plugin/micro"
-)
-
-func main() {
-	// Begin by allocating a generator. The request and response structures are stored there
-	// so we can do error handling easily - the response structure contains the field to
-	// report failure.
-	g := generator.New()
-
-	data, err := ioutil.ReadAll(os.Stdin)
-	if err != nil {
-		g.Error(err, "reading input")
-	}
-
-	if err := proto.Unmarshal(data, g.Request); err != nil {
-		g.Error(err, "parsing input proto")
-	}
-
-	if len(g.Request.FileToGenerate) == 0 {
-		g.Fail("no files to generate")
-	}
-
-	g.CommandLineParameters(g.Request.GetParameter())
-
-	// Create a wrapped version of the Descriptors and EnumDescriptors that
-	// point to the file that defines them.
-	g.WrapTypes()
-
-	g.SetPackageNames()
-	g.BuildTypeNameMap()
-
-	g.GenerateAllFiles()
-
-	// Send back the results.
-	data, err = proto.Marshal(g.Response)
-	if err != nil {
-		g.Error(err, "failed to marshal output proto")
-	}
-	_, err = os.Stdout.Write(data)
-	if err != nil {
-		g.Error(err, "failed to write output proto")
-	}
-}

cmd/protoc-gen-micro/plugin/micro/micro.go

@@ -1,583 +0,0 @@
-package micro
-
-import (
-	"fmt"
-	"path"
-	"strconv"
-	"strings"
-
-	"github.com/golang/protobuf/proto"
-	pb "github.com/golang/protobuf/protoc-gen-go/descriptor"
-	"github.com/unistack-org/micro/v3/cmd/protoc-gen-micro/generator"
-	options "google.golang.org/genproto/googleapis/api/annotations"
-)
-
-// Paths for packages used by code generated in this file,
-// relative to the import_prefix of the generator.Generator.
-const (
-	apiPkgPath     = "github.com/unistack-org/micro/v3/api"
-	contextPkgPath = "context"
-	clientPkgPath  = "github.com/unistack-org/micro/v3/client"
-	serverPkgPath  = "github.com/unistack-org/micro/v3/server"
-)
-
-func init() {
-	generator.RegisterPlugin(new(micro))
-}
-
-// micro is an implementation of the Go protocol buffer compiler's
-// plugin architecture.  It generates bindings for go-micro support.
-type micro struct {
-	gen *generator.Generator
-}
-
-// Name returns the name of this plugin, "micro".
-func (g *micro) Name() string {
-	return "micro"
-}
-
-// The names for packages imported in the generated code.
-// They may vary from the final path component of the import path
-// if the name is used by other packages.
-var (
-	apiPkg     string
-	contextPkg string
-	clientPkg  string
-	serverPkg  string
-	pkgImports map[generator.GoPackageName]bool
-)
-
-// Init initializes the plugin.
-func (g *micro) Init(gen *generator.Generator) {
-	g.gen = gen
-	apiPkg = generator.RegisterUniquePackageName("api", nil)
-	contextPkg = generator.RegisterUniquePackageName("context", nil)
-	clientPkg = generator.RegisterUniquePackageName("client", nil)
-	serverPkg = generator.RegisterUniquePackageName("server", nil)
-}
-
-// Given a type name defined in a .proto, return its object.
-// Also record that we're using it, to guarantee the associated import.
-func (g *micro) objectNamed(name string) generator.Object {
-	g.gen.RecordTypeUse(name)
-	return g.gen.ObjectNamed(name)
-}
-
-// Given a type name defined in a .proto, return its name as we will print it.
-func (g *micro) typeName(str string) string {
-	return g.gen.TypeName(g.objectNamed(str))
-}
-
-// P forwards to g.gen.P.
-func (g *micro) P(args ...interface{}) { g.gen.P(args...) }
-
-// Generate generates code for the services in the given file.
-func (g *micro) Generate(file *generator.FileDescriptor) {
-	if len(file.FileDescriptorProto.Service) == 0 {
-		return
-	}
-	g.P("// Reference imports to suppress errors if they are not otherwise used.")
-	g.P("var _ ", apiPkg, ".Endpoint")
-	g.P("var _ ", contextPkg, ".Context")
-	g.P("var _ ", clientPkg, ".Option")
-	g.P("var _ ", serverPkg, ".Option")
-	g.P()
-
-	for i, service := range file.FileDescriptorProto.Service {
-		g.generateService(file, service, i)
-	}
-}
-
-// GenerateImports generates the import declaration for this file.
-func (g *micro) GenerateImports(file *generator.FileDescriptor, imports map[generator.GoImportPath]generator.GoPackageName) {
-	if len(file.FileDescriptorProto.Service) == 0 {
-		return
-	}
-	g.P("import (")
-	g.P(apiPkg, " ", strconv.Quote(path.Join(g.gen.ImportPrefix, apiPkgPath)))
-	g.P(contextPkg, " ", strconv.Quote(path.Join(g.gen.ImportPrefix, contextPkgPath)))
-	g.P(clientPkg, " ", strconv.Quote(path.Join(g.gen.ImportPrefix, clientPkgPath)))
-	g.P(serverPkg, " ", strconv.Quote(path.Join(g.gen.ImportPrefix, serverPkgPath)))
-	g.P(")")
-	g.P()
-
-	// We need to keep track of imported packages to make sure we don't produce
-	// a name collision when generating types.
-	pkgImports = make(map[generator.GoPackageName]bool)
-	for _, name := range imports {
-		pkgImports[name] = true
-	}
-}
-
-// reservedClientName records whether a client name is reserved on the client side.
-var reservedClientName = map[string]bool{
-	// TODO: do we need any in go-micro?
-}
-
-func unexport(s string) string {
-	if len(s) == 0 {
-		return ""
-	}
-	name := strings.ToLower(s[:1]) + s[1:]
-	if pkgImports[generator.GoPackageName(name)] {
-		return name + "_"
-	}
-	return name
-}
-
-// generateService generates all the code for the named service.
-func (g *micro) generateService(file *generator.FileDescriptor, service *pb.ServiceDescriptorProto, index int) {
-	path := fmt.Sprintf("6,%d", index) // 6 means service.
-
-	origServName := service.GetName()
-	serviceName := strings.ToLower(service.GetName())
-	if pkg := file.GetPackage(); pkg != "" {
-		serviceName = pkg
-	}
-	servName := generator.CamelCase(origServName)
-	servAlias := servName + "Service"
-
-	// strip suffix
-	if strings.HasSuffix(servAlias, "ServiceService") {
-		servAlias = strings.TrimSuffix(servAlias, "Service")
-	}
-
-	g.P()
-	g.P("// Api Endpoints for ", servName, " service")
-	g.P()
-
-	g.P("func New", servName, "Endpoints () []*", apiPkg, ".Endpoint {")
-	g.P("return []*", apiPkg, ".Endpoint{")
-	for _, method := range service.Method {
-		if method.Options != nil && proto.HasExtension(method.Options, options.E_Http) {
-			g.P("&", apiPkg, ".Endpoint{")
-			g.generateEndpoint(servName, method)
-			g.P("},")
-		}
-	}
-	g.P("}")
-	g.P("}")
-	g.P()
-
-	g.P()
-	g.P("// Client API for ", servName, " service")
-	g.P()
-
-	// Client interface.
-	g.P("type ", servAlias, " interface {")
-	for i, method := range service.Method {
-		g.gen.PrintComments(fmt.Sprintf("%s,2,%d", path, i)) // 2 means method in a service.
-		g.P(g.generateClientSignature(servName, method))
-	}
-	g.P("}")
-	g.P()
-
-	// Client structure.
-	g.P("type ", unexport(servAlias), " struct {")
-	g.P("c ", clientPkg, ".Client")
-	g.P("name string")
-	g.P("}")
-	g.P()
-
-	// NewClient factory.
-	g.P("func New", servAlias, " (name string, c ", clientPkg, ".Client) ", servAlias, " {")
-	/*
-		g.P("if c == nil {")
-		g.P("c = ", clientPkg, ".NewClient()")
-		g.P("}")
-		g.P("if len(name) == 0 {")
-		g.P(`name = "`, serviceName, `"`)
-		g.P("}")
-	*/
-	g.P("return &", unexport(servAlias), "{")
-	g.P("c: c,")
-	g.P("name: name,")
-	g.P("}")
-	g.P("}")
-	g.P()
-	var methodIndex, streamIndex int
-	serviceDescVar := "_" + servName + "_serviceDesc"
-	// Client method implementations.
-	for _, method := range service.Method {
-		var descExpr string
-		if !method.GetServerStreaming() {
-			// Unary RPC method
-			descExpr = fmt.Sprintf("&%s.Methods[%d]", serviceDescVar, methodIndex)
-			methodIndex++
-		} else {
-			// Streaming RPC method
-			descExpr = fmt.Sprintf("&%s.Streams[%d]", serviceDescVar, streamIndex)
-			streamIndex++
-		}
-		g.generateClientMethod(serviceName, servName, serviceDescVar, method, descExpr)
-	}
-
-	g.P("// Server API for ", servName, " service")
-	g.P()
-
-	// Server interface.
-	serverType := servName + "Handler"
-	g.P("type ", serverType, " interface {")
-	for i, method := range service.Method {
-		g.gen.PrintComments(fmt.Sprintf("%s,2,%d", path, i)) // 2 means method in a service.
-		g.P(g.generateServerSignature(servName, method))
-	}
-	g.P("}")
-	g.P()
-
-	// Server registration.
-	g.P("func Register", servName, "Handler(s ", serverPkg, ".Server, hdlr ", serverType, ", opts ...", serverPkg, ".HandlerOption) error {")
-	g.P("type ", unexport(servName), " interface {")
-
-	// generate interface methods
-	for _, method := range service.Method {
-		methName := generator.CamelCase(method.GetName())
-		inType := g.typeName(method.GetInputType())
-		outType := g.typeName(method.GetOutputType())
-
-		if !method.GetServerStreaming() && !method.GetClientStreaming() {
-			g.P(methName, "(ctx ", contextPkg, ".Context, req *", inType, ", rsp *", outType, ") error")
-			continue
-		}
-		g.P(methName, "(ctx ", contextPkg, ".Context, stream server.Stream) error")
-	}
-	g.P("}")
-	g.P("type ", servName, " struct {")
-	g.P(unexport(servName))
-	g.P("}")
-	g.P("h := &", unexport(servName), "Handler{hdlr}")
-	for _, method := range service.Method {
-		if method.Options != nil && proto.HasExtension(method.Options, options.E_Http) {
-			g.P("opts = append(opts, ", apiPkg, ".WithEndpoint(&", apiPkg, ".Endpoint{")
-			g.generateEndpoint(servName, method)
-			g.P("}))")
-		}
-	}
-	g.P("return s.Handle(s.NewHandler(&", servName, "{h}, opts...))")
-	g.P("}")
-	g.P()
-
-	g.P("type ", unexport(servName), "Handler struct {")
-	g.P(serverType)
-	g.P("}")
-
-	// Server handler implementations.
-	var handlerNames []string
-	for _, method := range service.Method {
-		hname := g.generateServerMethod(servName, method)
-		handlerNames = append(handlerNames, hname)
-	}
-}
-
-// generateEndpoint creates the api endpoint
-func (g *micro) generateEndpoint(servName string, method *pb.MethodDescriptorProto) {
-	if method.Options == nil || !proto.HasExtension(method.Options, options.E_Http) {
-		return
-	}
-	// http rules
-	r, err := proto.GetExtension(method.Options, options.E_Http)
-	if err != nil {
-		return
-	}
-	rule := r.(*options.HttpRule)
-	var meth string
-	var path string
-	switch {
-	case len(rule.GetDelete()) > 0:
-		meth = "DELETE"
-		path = rule.GetDelete()
-	case len(rule.GetGet()) > 0:
-		meth = "GET"
-		path = rule.GetGet()
-	case len(rule.GetPatch()) > 0:
-		meth = "PATCH"
-		path = rule.GetPatch()
-	case len(rule.GetPost()) > 0:
-		meth = "POST"
-		path = rule.GetPost()
-	case len(rule.GetPut()) > 0:
-		meth = "PUT"
-		path = rule.GetPut()
-	}
-	if len(meth) == 0 || len(path) == 0 {
-		return
-	}
-	// TODO: process additional bindings
-	g.P("Name:", fmt.Sprintf(`"%s.%s",`, servName, method.GetName()))
-	g.P("Path:", fmt.Sprintf(`[]string{"%s"},`, path))
-	g.P("Method:", fmt.Sprintf(`[]string{"%s"},`, meth))
-	if len(rule.GetGet()) == 0 {
-		g.P("Body:", fmt.Sprintf(`"%s",`, rule.GetBody()))
-	}
-	if method.GetServerStreaming() || method.GetClientStreaming() {
-		g.P("Stream: true,")
-	}
-	g.P(`Handler: "rpc",`)
-}
-
-// generateClientSignature returns the client-side signature for a method.
-func (g *micro) generateClientSignature(servName string, method *pb.MethodDescriptorProto) string {
-	origMethName := method.GetName()
-	methName := generator.CamelCase(origMethName)
-	if reservedClientName[methName] {
-		methName += "_"
-	}
-	reqArg := ", req *" + g.typeName(method.GetInputType())
-	if method.GetClientStreaming() {
-		reqArg = ""
-	}
-	respName := "*" + g.typeName(method.GetOutputType())
-	if method.GetServerStreaming() || method.GetClientStreaming() {
-		respName = servName + "_" + generator.CamelCase(origMethName) + "Service"
-	}
-
-	return fmt.Sprintf("%s(ctx %s.Context%s, opts ...%s.CallOption) (%s, error)", methName, contextPkg, reqArg, clientPkg, respName)
-}
-
-func (g *micro) generateClientMethod(reqServ, servName, serviceDescVar string, method *pb.MethodDescriptorProto, descExpr string) {
-	methName := generator.CamelCase(method.GetName())
-	reqMethod := fmt.Sprintf("%s.%s", servName, methName)
-	inType := g.typeName(method.GetInputType())
-	outType := g.typeName(method.GetOutputType())
-
-	servAlias := servName + "Service"
-
-	// strip suffix
-	if strings.HasSuffix(servAlias, "ServiceService") {
-		servAlias = strings.TrimSuffix(servAlias, "Service")
-	}
-
-	g.P("func (c *", unexport(servAlias), ") ", g.generateClientSignature(servName, method), "{")
-	if !method.GetServerStreaming() && !method.GetClientStreaming() {
-		g.P("rsp := &", outType, "{}")
-		// TODO: Pass descExpr to Invoke.
-		g.P(`err := c.c.Call(ctx, c.c.NewRequest(c.name, "`, reqMethod, `", req), rsp, opts...)`)
-		g.P("if err != nil { return nil, err }")
-		g.P("return rsp, nil")
-		g.P("}")
-		g.P()
-		return
-	}
-	streamType := unexport(servAlias) + methName
-	g.P(`stream, err := c.c.Stream(ctx, c.c.NewRequest(c.name, "`, reqMethod, `", &`, inType, `{}), opts...)`)
-	g.P("if err != nil { return nil, err }")
-
-	if !method.GetClientStreaming() {
-		g.P("if err := stream.Send(req); err != nil { return nil, err }")
-	}
-
-	g.P("return &", streamType, "{stream}, nil")
-	g.P("}")
-	g.P()
-
-	genSend := method.GetClientStreaming()
-	genRecv := method.GetServerStreaming()
-
-	// Stream auxiliary types and methods.
-	g.P("type ", servName, "_", methName, "Service interface {")
-	g.P("Context() context.Context")
-	g.P("SendMsg(interface{}) error")
-	g.P("RecvMsg(interface{}) error")
-
-	if genSend && !genRecv {
-		// client streaming, the server will send a response upon close
-		g.P("CloseAndRecv() (*", outType, ", error)")
-	}
-	g.P("Close() error")
-
-	if genSend {
-		g.P("Send(*", inType, ") error")
-	}
-	if genRecv {
-		g.P("Recv() (*", outType, ", error)")
-	}
-	g.P("}")
-	g.P()
-
-	g.P("type ", streamType, " struct {")
-	g.P("stream ", clientPkg, ".Stream")
-	g.P("}")
-	g.P()
-
-	if genSend && !genRecv {
-		// client streaming, the server will send a response upon close
-		g.P("func (x *", streamType, ") CloseAndRecv() (*", outType, ", error) {")
-		g.P("if err := x.stream.Close(); err != nil {")
-		g.P("return nil, err")
-		g.P("}")
-		g.P("r := new(", outType, ")")
-		g.P("err := x.RecvMsg(r)")
-		g.P("return r, err")
-		g.P("}")
-		g.P()
-	}
-	g.P("func (x *", streamType, ") Close() error {")
-	g.P("return x.stream.Close()")
-	g.P("}")
-	g.P()
-
-	g.P("func (x *", streamType, ") Context() context.Context {")
-	g.P("return x.stream.Context()")
-	g.P("}")
-	g.P()
-
-	g.P("func (x *", streamType, ") SendMsg(m interface{}) error {")
-	g.P("return x.stream.Send(m)")
-	g.P("}")
-	g.P()
-
-	g.P("func (x *", streamType, ") RecvMsg(m interface{}) error {")
-	g.P("return x.stream.Recv(m)")
-	g.P("}")
-	g.P()
-
-	if genSend {
-		g.P("func (x *", streamType, ") Send(m *", inType, ") error {")
-		g.P("return x.stream.Send(m)")
-		g.P("}")
-		g.P()
-
-	}
-
-	if genRecv {
-		g.P("func (x *", streamType, ") Recv() (*", outType, ", error) {")
-		g.P("m := &", outType, "{}")
-		g.P("err := x.stream.Recv(m)")
-		g.P("if err != nil {")
-		g.P("return nil, err")
-		g.P("}")
-		g.P("return m, nil")
-		g.P("}")
-		g.P()
-	}
-}
-
-// generateServerSignature returns the server-side signature for a method.
-func (g *micro) generateServerSignature(servName string, method *pb.MethodDescriptorProto) string {
-	origMethName := method.GetName()
-	methName := generator.CamelCase(origMethName)
-	if reservedClientName[methName] {
-		methName += "_"
-	}
-
-	var reqArgs []string
-	ret := "error"
-	reqArgs = append(reqArgs, contextPkg+".Context")
-
-	if !method.GetClientStreaming() {
-		reqArgs = append(reqArgs, "*"+g.typeName(method.GetInputType()))
-	}
-	if method.GetServerStreaming() || method.GetClientStreaming() {
-		reqArgs = append(reqArgs, servName+"_"+generator.CamelCase(origMethName)+"Stream")
-	}
-	if !method.GetClientStreaming() && !method.GetServerStreaming() {
-		reqArgs = append(reqArgs, "*"+g.typeName(method.GetOutputType()))
-	}
-	return methName + "(" + strings.Join(reqArgs, ", ") + ") " + ret
-}
-
-func (g *micro) generateServerMethod(servName string, method *pb.MethodDescriptorProto) string {
-	methName := generator.CamelCase(method.GetName())
-	hname := fmt.Sprintf("_%s_%s_Handler", servName, methName)
-	serveType := servName + "Handler"
-	inType := g.typeName(method.GetInputType())
-	outType := g.typeName(method.GetOutputType())
-
-	if !method.GetServerStreaming() && !method.GetClientStreaming() {
-		g.P("func (h *", unexport(servName), "Handler) ", methName, "(ctx ", contextPkg, ".Context, req *", inType, ", rsp *", outType, ") error {")
-		g.P("return h.", serveType, ".", methName, "(ctx, req, rsp)")
-		g.P("}")
-		g.P()
-		return hname
-	}
-	streamType := unexport(servName) + methName + "Stream"
-	g.P("func (h *", unexport(servName), "Handler) ", methName, "(ctx ", contextPkg, ".Context, stream server.Stream) error {")
-	if !method.GetClientStreaming() {
-		g.P("m := &", inType, "{}")
-		g.P("if err := stream.Recv(m); err != nil { return err }")
-		g.P("return h.", serveType, ".", methName, "(ctx, m, &", streamType, "{stream})")
-	} else {
-		g.P("return h.", serveType, ".", methName, "(ctx, &", streamType, "{stream})")
-	}
-	g.P("}")
-	g.P()
-
-	genSend := method.GetServerStreaming()
-	genRecv := method.GetClientStreaming()
-
-	// Stream auxiliary types and methods.
-	g.P("type ", servName, "_", methName, "Stream interface {")
-	g.P("Context() context.Context")
-	g.P("SendMsg(interface{}) error")
-	g.P("RecvMsg(interface{}) error")
-	if !genSend {
-		// client streaming, the server will send a response upon close
-		g.P("SendAndClose(*", outType, ")  error")
-	}
-	g.P("Close() error")
-
-	if genSend {
-		g.P("Send(*", outType, ") error")
-	}
-
-	if genRecv {
-		g.P("Recv() (*", inType, ", error)")
-	}
-
-	g.P("}")
-	g.P()
-
-	g.P("type ", streamType, " struct {")
-	g.P("stream ", serverPkg, ".Stream")
-	g.P("}")
-	g.P()
-
-	if !genSend {
-		// client streaming, the server will send a response upon close
-		g.P("func (x *", streamType, ") SendAndClose(in *", outType, ") error {")
-		g.P("if err := x.SendMsg(in); err != nil {")
-		g.P("return err")
-		g.P("}")
-		g.P("return x.stream.Close()")
-		g.P("}")
-		g.P()
-	}
-	// other types of rpc don't send a response when the stream closes
-	g.P("func (x *", streamType, ") Close() error {")
-	g.P("return x.stream.Close()")
-	g.P("}")
-	g.P()
-
-	g.P("func (x *", streamType, ") Context() context.Context {")
-	g.P("return x.stream.Context()")
-	g.P("}")
-	g.P()
-
-	g.P("func (x *", streamType, ") SendMsg(m interface{}) error {")
-	g.P("return x.stream.Send(m)")
-	g.P("}")
-	g.P()
-
-	g.P("func (x *", streamType, ") RecvMsg(m interface{}) error {")
-	g.P("return x.stream.Recv(m)")
-	g.P("}")
-	g.P()
-
-	if genSend {
-		g.P("func (x *", streamType, ") Send(m *", outType, ") error {")
-		g.P("return x.stream.Send(m)")
-		g.P("}")
-		g.P()
-	}
-
-	if genRecv {
-		g.P("func (x *", streamType, ") Recv() (*", inType, ", error) {")
-		g.P("m := &", inType, "{}")
-		g.P("if err := x.stream.Recv(m); err != nil { return nil, err }")
-		g.P("return m, nil")
-		g.P("}")
-		g.P()
-	}
-
-	return hname
-}

codec/codec.go

@@ -4,9 +4,12 @@ package codec
 import (
 	"errors"
 	"io"
+
+	"github.com/unistack-org/micro/v3/metadata"
 )
 
 const (
+	// Message types
 	Error MessageType = iota
 	Request
 	Response
@@ -16,40 +19,28 @@ const (
 var (
 	// ErrInvalidMessage returned when invalid messge passed to codec
 	ErrInvalidMessage = errors.New("invalid message")
+	// ErrUnknownContentType returned when content-type is unknown
+	ErrUnknownContentType = errors.New("unknown content-type")
+)
+
+var (
+	// DefaultMaxMsgSize specifies how much data codec can handle
+	DefaultMaxMsgSize int   = 1024 * 1024 * 4 // 4Mb
+	DefaultCodec      Codec = NewCodec()
 )
 
 // MessageType
 type MessageType int
 
-// NewCodec takes in a connection/buffer and returns a new Codec
-type NewCodec func(io.ReadWriteCloser) Codec
-
-// Codec encodes/decodes various types of messages used within go-micro.
+// Codec encodes/decodes various types of messages used within micro.
 // ReadHeader and ReadBody are called in pairs to read requests/responses
 // from the connection. Close is called when finished with the
 // connection. ReadBody may be called with a nil argument to force the
 // body to be read and discarded.
 type Codec interface {
-	Reader
-	Writer
-	Close() error
-	String() string
-}
-
-// Reader interface
-type Reader interface {
-	ReadHeader(*Message, MessageType) error
-	ReadBody(interface{}) error
-}
-
-// Writer interface
-type Writer interface {
-	Write(*Message, interface{}) error
-}
-
-// Marshaler is a simple encoding interface used for the broker/transport
-// where headers are not supported by the underlying implementation.
-type Marshaler interface {
+	ReadHeader(io.Reader, *Message, MessageType) error
+	ReadBody(io.Reader, interface{}) error
+	Write(io.Writer, *Message, interface{}) error
 	Marshal(interface{}) ([]byte, error)
 	Unmarshal([]byte, interface{}) error
 	String() string
@@ -67,6 +58,11 @@ type Message struct {
 	Error    string
 
 	// The values read from the socket
-	Header map[string]string
+	Header metadata.Metadata
 	Body   []byte
 }
+
+// NewMessage creates new codec message
+func NewMessage(t MessageType) *Message {
+	return &Message{Type: t, Header: metadata.New(0)}
+}

codec/noop.go

@@ -0,0 +1,136 @@
+package codec
+
+import (
+	"encoding/json"
+	"io"
+	"io/ioutil"
+)
+
+type noopCodec struct {
+}
+
+// Frame gives us the ability to define raw data to send over the pipes
+type Frame struct {
+	Data []byte
+}
+
+func (c *noopCodec) ReadHeader(conn io.Reader, m *Message, t MessageType) error {
+	return nil
+}
+
+func (c *noopCodec) ReadBody(conn io.Reader, b interface{}) error {
+	// read bytes
+	buf, err := ioutil.ReadAll(conn)
+	if err != nil {
+		return err
+	}
+
+	if b == nil {
+		return nil
+	}
+
+	switch v := b.(type) {
+	case string:
+		v = string(buf)
+	case *string:
+		*v = string(buf)
+	case []byte:
+		v = buf
+	case *[]byte:
+		*v = buf
+	case *Frame:
+		v.Data = buf
+	default:
+		return json.Unmarshal(buf, v)
+	}
+
+	return nil
+}
+
+func (c *noopCodec) Write(conn io.Writer, m *Message, b interface{}) error {
+	if b == nil {
+		return nil
+	}
+
+	var v []byte
+	switch vb := b.(type) {
+	case *Frame:
+		v = vb.Data
+	case string:
+		v = []byte(vb)
+	case *string:
+		v = []byte(*vb)
+	case *[]byte:
+		v = *vb
+	case []byte:
+		v = vb
+	default:
+		var err error
+		v, err = json.Marshal(vb)
+		if err != nil {
+			return err
+		}
+	}
+	_, err := conn.Write(v)
+	return err
+}
+
+func (c *noopCodec) String() string {
+	return "noop"
+}
+
+// NewCodec returns new noop codec
+func NewCodec() Codec {
+	return &noopCodec{}
+}
+
+func (c *noopCodec) Marshal(v interface{}) ([]byte, error) {
+	if v == nil {
+		return nil, nil
+	}
+
+	switch ve := v.(type) {
+	case string:
+		return []byte(ve), nil
+	case *string:
+		return []byte(*ve), nil
+	case *[]byte:
+		return *ve, nil
+	case []byte:
+		return ve, nil
+	case *Frame:
+		return ve.Data, nil
+	case *Message:
+		return ve.Body, nil
+	}
+
+	return json.Marshal(v)
+}
+
+func (c *noopCodec) Unmarshal(d []byte, v interface{}) error {
+	if v == nil {
+		return nil
+	}
+	switch ve := v.(type) {
+	case string:
+		ve = string(d)
+		return nil
+	case *string:
+		*ve = string(d)
+		return nil
+	case []byte:
+		ve = d
+		return nil
+	case *[]byte:
+		*ve = d
+		return nil
+	case *Frame:
+		ve.Data = d
+		return nil
+	case *Message:
+		ve.Body = d
+		return nil
+	}
+
+	return json.Unmarshal(d, v)
+}

codec/options.go

@@ -0,0 +1,61 @@
+package codec
+
+import (
+	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/meter"
+	"github.com/unistack-org/micro/v3/tracer"
+)
+
+// Option func
+type Option func(*Options)
+
+// Options contains codec options
+type Options struct {
+	MaxMsgSize int
+	Meter      meter.Meter
+	Logger     logger.Logger
+	Tracer     tracer.Tracer
+}
+
+// MaxMsgSize sets the max message size
+func MaxMsgSize(n int) Option {
+	return func(o *Options) {
+		o.MaxMsgSize = n
+	}
+}
+
+// Logger sets the logger
+func Logger(l logger.Logger) Option {
+	return func(o *Options) {
+		o.Logger = l
+	}
+}
+
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
+// Meter sets the meter
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Logger:     logger.DefaultLogger,
+		Meter:      meter.DefaultMeter,
+		Tracer:     tracer.DefaultTracer,
+		MaxMsgSize: DefaultMaxMsgSize,
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
+}

config/config.go

@@ -3,52 +3,55 @@ package config
 
 import (
 	"context"
-
-	"github.com/unistack-org/micro/v3/config/loader"
-	"github.com/unistack-org/micro/v3/config/reader"
-	"github.com/unistack-org/micro/v3/config/source"
+	"errors"
 )
 
 var (
-	DefaultConfig Config
+	// DefaultConfig default config
+	DefaultConfig Config = NewConfig()
+)
+
+var (
+	// ErrCodecMissing is returned when codec needed and not specified
+	ErrCodecMissing = errors.New("codec missing")
+	// ErrInvalidStruct is returned when the target struct is invalid
+	ErrInvalidStruct = errors.New("invalid struct specified")
+	// ErrWatcherStopped is returned when source watcher has been stopped
+	ErrWatcherStopped = errors.New("watcher stopped")
 )
 
 // Config is an interface abstraction for dynamic configuration
 type Config interface {
-	// provide the reader.Values interface
-	reader.Values
+	Name() string
 	// Init the config
 	Init(opts ...Option) error
 	// Options in the config
 	Options() Options
-	// Stop the config loader/watcher
-	Close() error
-	// Load config sources
-	Load(source ...source.Source) error
-	// Force a source changeset sync
-	Sync() error
+	// Load config from sources
+	Load(context.Context) error
+	// Save config to sources
+	Save(context.Context) error
 	// Watch a value for changes
-	Watch(path ...string) (Watcher, error)
+	//	Watch(interface{}) (Watcher, error)
+	String() string
 }
 
 // Watcher is the config watcher
-type Watcher interface {
-	Next() (reader.Value, error)
-	Stop() error
-}
-
-type Options struct {
-	Loader loader.Loader
-	Reader reader.Reader
-	Source []source.Source
-
-	// for alternative data
-	Context context.Context
-}
-
-type Option func(o *Options)
-
-// NewConfig returns new config
-func NewConfig(opts ...Option) (Config, error) {
-	return newConfig(opts...)
+//type Watcher interface {
+//	Next() (, error)
+//	Stop() error
+//}
+
+// Load loads config from config sources
+func Load(ctx context.Context, cs ...Config) error {
+	var err error
+	for _, c := range cs {
+		if err = c.Init(); err != nil {
+			return err
+		}
+		if err = c.Load(ctx); err != nil {
+			return err
+		}
+	}
+	return nil
 }

config/context.go

@@ -0,0 +1,32 @@
+package config
+
+import (
+	"context"
+)
+
+type configKey struct{}
+
+func FromContext(ctx context.Context) (Config, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	c, ok := ctx.Value(configKey{}).(Config)
+	return c, ok
+}
+
+func NewContext(ctx context.Context, c Config) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, configKey{}, c)
+}
+
+// SetOption returns a function to setup a context with given value
+func SetOption(k, v interface{}) Option {
+	return func(o *Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

config/default.go

@@ -1,294 +1,264 @@
 package config
 
 import (
-	"bytes"
-	"fmt"
-	"sync"
-	"time"
+	"context"
+	"reflect"
+	"strconv"
+	"strings"
 
-	"github.com/unistack-org/micro/v3/config/loader"
-	"github.com/unistack-org/micro/v3/config/reader"
-	"github.com/unistack-org/micro/v3/config/source"
+	"github.com/imdario/mergo"
+	rutil "github.com/unistack-org/micro/v3/util/reflect"
 )
 
-type config struct {
-	exit chan bool
+type defaultConfig struct {
 	opts Options
-
-	sync.RWMutex
-	// the current snapshot
-	snap *loader.Snapshot
-	// the current values
-	vals reader.Values
 }
 
-type watcher struct {
-	lw    loader.Watcher
-	rd    reader.Reader
-	path  []string
-	value reader.Value
-}
-
-func newConfig(opts ...Option) (Config, error) {
-	var c config
-
-	if err := c.Init(opts...); err != nil {
-		return nil, err
-	}
-
-	go c.run()
-	return &c, nil
-}
-
-func (c *config) Init(opts ...Option) error {
-	c.opts = Options{}
-	c.exit = make(chan bool)
-	for _, o := range opts {
-		o(&c.opts)
-	}
-
-	err := c.opts.Loader.Load(c.opts.Source...)
-	if err != nil {
-		return err
-	}
-
-	c.snap, err = c.opts.Loader.Snapshot()
-	if err != nil {
-		return err
-	}
-
-	c.vals, err = c.opts.Reader.Values(c.snap.ChangeSet)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func (c *config) Options() Options {
+func (c *defaultConfig) Options() Options {
 	return c.opts
 }
 
-func (c *config) run() {
-	watch := func(w loader.Watcher) error {
-		for {
-			// get changeset
-			snap, err := w.Next()
-			if err != nil {
+func (c *defaultConfig) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&c.opts)
+	}
+	return nil
+}
+
+func (c *defaultConfig) Load(ctx context.Context) error {
+	for _, fn := range c.opts.BeforeLoad {
+		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
+			return err
+		}
+	}
+
+	src, err := rutil.Zero(c.opts.Struct)
+	if err == nil {
+		valueOf := reflect.ValueOf(src)
+		if err = c.fillValues(ctx, valueOf); err == nil {
+			err = mergo.Merge(c.opts.Struct, src, mergo.WithOverride, mergo.WithTypeCheck, mergo.WithAppendSlice)
+		}
+	}
+
+	if err != nil && !c.opts.AllowFail {
+		return err
+	}
+
+	for _, fn := range c.opts.AfterLoad {
+		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (c *defaultConfig) fillValue(ctx context.Context, value reflect.Value, val string) error {
+	if !rutil.IsEmpty(value) {
+		return nil
+	}
+	switch value.Kind() {
+	case reflect.Map:
+		t := value.Type()
+		nvals := strings.FieldsFunc(val, func(c rune) bool { return c == ',' || c == ';' })
+		if value.IsNil() {
+			value.Set(reflect.MakeMapWithSize(t, len(nvals)))
+		}
+		kt := t.Key()
+		et := t.Elem()
+		for _, nval := range nvals {
+			kv := strings.FieldsFunc(nval, func(c rune) bool { return c == '=' })
+			mkey := reflect.Indirect(reflect.New(kt))
+			mval := reflect.Indirect(reflect.New(et))
+			if err := c.fillValue(ctx, mkey, kv[0]); err != nil {
 				return err
 			}
-
-			c.Lock()
-
-			if c.snap != nil && c.snap.Version >= snap.Version {
-				c.Unlock()
-				continue
+			if err := c.fillValue(ctx, mval, kv[1]); err != nil {
+				return err
 			}
-
-			// save
-			c.snap = snap
-
-			// set values
-			c.vals, _ = c.opts.Reader.Values(snap.ChangeSet)
-
-			c.Unlock()
+			value.SetMapIndex(mkey, mval)
 		}
+	case reflect.Slice, reflect.Array:
+		nvals := strings.FieldsFunc(val, func(c rune) bool { return c == ',' || c == ';' })
+		value.Set(reflect.MakeSlice(reflect.SliceOf(value.Type().Elem()), len(nvals), len(nvals)))
+		for idx, nval := range nvals {
+			nvalue := reflect.Indirect(reflect.New(value.Type().Elem()))
+			if err := c.fillValue(ctx, nvalue, nval); err != nil {
+				return err
+			}
+			value.Index(idx).Set(nvalue)
+		}
+	case reflect.Bool:
+		v, err := strconv.ParseBool(val)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(v))
+	case reflect.String:
+		value.Set(reflect.ValueOf(val))
+	case reflect.Float32:
+		v, err := strconv.ParseFloat(val, 32)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(float32(v)))
+	case reflect.Float64:
+		v, err := strconv.ParseFloat(val, 64)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(float64(v)))
+	case reflect.Int:
+		v, err := strconv.ParseInt(val, 10, 0)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(int(v)))
+	case reflect.Int8:
+		v, err := strconv.ParseInt(val, 10, 8)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(v))
+	case reflect.Int16:
+		v, err := strconv.ParseInt(val, 10, 16)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(int16(v)))
+	case reflect.Int32:
+		v, err := strconv.ParseInt(val, 10, 32)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(int32(v)))
+	case reflect.Int64:
+		v, err := strconv.ParseInt(val, 10, 64)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(int64(v)))
+	case reflect.Uint:
+		v, err := strconv.ParseUint(val, 10, 0)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(uint(v)))
+	case reflect.Uint8:
+		v, err := strconv.ParseUint(val, 10, 8)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(uint8(v)))
+	case reflect.Uint16:
+		v, err := strconv.ParseUint(val, 10, 16)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(uint16(v)))
+	case reflect.Uint32:
+		v, err := strconv.ParseUint(val, 10, 32)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(uint32(v)))
+	case reflect.Uint64:
+		v, err := strconv.ParseUint(val, 10, 64)
+		if err != nil {
+			return err
+		}
+		value.Set(reflect.ValueOf(uint64(v)))
+	}
+	return nil
+}
+
+func (c *defaultConfig) fillValues(ctx context.Context, valueOf reflect.Value) error {
+	var values reflect.Value
+
+	if valueOf.Kind() == reflect.Ptr {
+		values = valueOf.Elem()
+	} else {
+		values = valueOf
 	}
 
-	for {
-		w, err := c.opts.Loader.Watch()
-		if err != nil {
-			time.Sleep(time.Second)
+	if values.Kind() == reflect.Invalid {
+		return ErrInvalidStruct
+	}
+
+	fields := values.Type()
+
+	for idx := 0; idx < fields.NumField(); idx++ {
+		field := fields.Field(idx)
+		value := values.Field(idx)
+		if !value.CanSet() {
+			continue
+		}
+		if len(field.PkgPath) != 0 {
+			continue
+		}
+		switch value.Kind() {
+		case reflect.Struct:
+			value.Set(reflect.Indirect(reflect.New(value.Type())))
+			if err := c.fillValues(ctx, value); err != nil {
+				return err
+			}
+			continue
+		case reflect.Ptr:
+			if value.IsNil() {
+				if value.Type().Elem().Kind() != reflect.Struct {
+					// nil pointer to a non-struct: leave it alone
+					break
+				}
+				// nil pointer to struct: create a zero instance
+				value.Set(reflect.New(value.Type().Elem()))
+			}
+			value = value.Elem()
+			if err := c.fillValues(ctx, value); err != nil {
+				return err
+			}
+			continue
+		}
+		tag, ok := field.Tag.Lookup(c.opts.StructTag)
+		if !ok {
 			continue
 		}
 
-		done := make(chan bool)
-
-		// the stop watch func
-		go func() {
-			select {
-			case <-done:
-			case <-c.exit:
-			}
-			w.Stop()
-		}()
-
-		// block watch
-		if err := watch(w); err != nil {
-			// do something better
-			time.Sleep(time.Second)
+		if err := c.fillValue(ctx, value, tag); err != nil {
+			return err
 		}
-
-		// close done chan
-		close(done)
-
-		// if the config is closed exit
-		select {
-		case <-c.exit:
-			return
-		default:
-		}
-	}
-}
-
-func (c *config) Map() map[string]interface{} {
-	c.RLock()
-	defer c.RUnlock()
-	return c.vals.Map()
-}
-
-func (c *config) Scan(v interface{}) error {
-	c.RLock()
-	defer c.RUnlock()
-	return c.vals.Scan(v)
-}
-
-// sync loads all the sources, calls the parser and updates the config
-func (c *config) Sync() error {
-	if err := c.opts.Loader.Sync(); err != nil {
-		return err
-	}
-
-	snap, err := c.opts.Loader.Snapshot()
-	if err != nil {
-		return err
-	}
-
-	c.Lock()
-	defer c.Unlock()
-
-	c.snap = snap
-	vals, err := c.opts.Reader.Values(snap.ChangeSet)
-	if err != nil {
-		return err
-	}
-	c.vals = vals
-
-	return nil
-}
-
-func (c *config) Close() error {
-	select {
-	case <-c.exit:
-		return nil
-	default:
-		close(c.exit)
-	}
-	return nil
-}
-
-func (c *config) Get(path ...string) (reader.Value, error) {
-	c.RLock()
-	defer c.RUnlock()
-
-	// did sync actually work?
-	if c.vals != nil {
-		return c.vals.Get(path...)
-	}
-
-	// no value
-	return nil, fmt.Errorf("no value")
-}
-
-func (c *config) Set(val interface{}, path ...string) error {
-	c.Lock()
-	defer c.Unlock()
-
-	if c.vals != nil {
-		c.vals.Set(val, path...)
-	}
-	return nil
-}
-
-func (c *config) Del(path ...string) error {
-	c.Lock()
-	defer c.Unlock()
-
-	if c.vals != nil {
-		c.vals.Del(path...)
 	}
 
 	return nil
 }
 
-func (c *config) Bytes() []byte {
-	c.RLock()
-	defer c.RUnlock()
-
-	if c.vals == nil {
-		return []byte{}
+func (c *defaultConfig) Save(ctx context.Context) error {
+	for _, fn := range c.opts.BeforeSave {
+		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
+			return err
+		}
 	}
 
-	return c.vals.Bytes()
-}
-
-func (c *config) Load(sources ...source.Source) error {
-	if err := c.opts.Loader.Load(sources...); err != nil {
-		return err
+	for _, fn := range c.opts.AfterSave {
+		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
+			return err
+		}
 	}
 
-	snap, err := c.opts.Loader.Snapshot()
-	if err != nil {
-		return err
-	}
-
-	c.Lock()
-	defer c.Unlock()
-
-	c.snap = snap
-	vals, err := c.opts.Reader.Values(snap.ChangeSet)
-	if err != nil {
-		return err
-	}
-	c.vals = vals
-
 	return nil
 }
 
-func (c *config) Watch(path ...string) (Watcher, error) {
-	value, err := c.Get(path...)
-	if err != nil {
-		return nil, err
+func (c *defaultConfig) String() string {
+	return "default"
+}
+
+func (c *defaultConfig) Name() string {
+	return c.opts.Name
+}
+
+func NewConfig(opts ...Option) Config {
+	options := NewOptions(opts...)
+	if len(options.StructTag) == 0 {
+		options.StructTag = "default"
 	}
-
-	w, err := c.opts.Loader.Watch(path...)
-	if err != nil {
-		return nil, err
-	}
-
-	return &watcher{
-		lw:    w,
-		rd:    c.opts.Reader,
-		path:  path,
-		value: value,
-	}, nil
-}
-
-func (c *config) String() string {
-	return "config"
-}
-
-func (w *watcher) Next() (reader.Value, error) {
-	for {
-		s, err := w.lw.Next()
-		if err != nil {
-			return nil, err
-		}
-
-		// only process changes
-		if bytes.Equal(w.value.Bytes(), s.ChangeSet.Data) {
-			continue
-		}
-
-		v, err := w.rd.Values(s.ChangeSet)
-		if err != nil {
-			return nil, err
-		}
-
-		return v.Get()
-	}
-}
-
-func (w *watcher) Stop() error {
-	return w.lw.Stop()
+	return &defaultConfig{opts: options}
 }

config/default_test.go

@@ -1,168 +1,52 @@
-// +build ignore
-
-package config
+package config_test
 
 import (
+	"context"
 	"fmt"
-	"os"
-	"path/filepath"
-	"runtime"
-	"strings"
 	"testing"
-	"time"
 
-	"github.com/unistack-org/micro/v3/config/source"
-	"github.com/unistack-org/micro/v3/config/source/env"
-	"github.com/unistack-org/micro/v3/config/source/file"
-	"github.com/unistack-org/micro/v3/config/source/memory"
+	"github.com/unistack-org/micro/v3/config"
 )
 
-func createFileForIssue18(t *testing.T, content string) *os.File {
-	data := []byte(content)
-	path := filepath.Join(os.TempDir(), fmt.Sprintf("file.%d", time.Now().UnixNano()))
-	fh, err := os.Create(path)
-	if err != nil {
-		t.Error(err)
-	}
-	_, err = fh.Write(data)
-	if err != nil {
-		t.Error(err)
-	}
-
-	return fh
-}
-
-func createFileForTest(t *testing.T) *os.File {
-	data := []byte(`{"foo": "bar"}`)
-	path := filepath.Join(os.TempDir(), fmt.Sprintf("file.%d", time.Now().UnixNano()))
-	fh, err := os.Create(path)
-	if err != nil {
-		t.Error(err)
-	}
-	_, err = fh.Write(data)
-	if err != nil {
-		t.Error(err)
-	}
-
-	return fh
-}
-
-func TestConfigLoadWithGoodFile(t *testing.T) {
-	fh := createFileForTest(t)
-	path := fh.Name()
-	defer func() {
-		fh.Close()
-		os.Remove(path)
-	}()
-
-	// Create new config
-	conf, err := NewConfig()
-	if err != nil {
-		t.Fatalf("Expected no error but got %v", err)
-	}
-	// Load file source
-	if err := conf.Load(file.NewSource(
-		file.WithPath(path),
-	)); err != nil {
-		t.Fatalf("Expected no error but got %v", err)
+type Cfg struct {
+	StringValue string `default:"string_value"`
+	IntValue    int    `default:"99"`
+	IgnoreValue string `json:"-"`
+	StructValue struct {
+		StringValue string `default:"string_value"`
 	}
 }
 
-func TestConfigLoadWithInvalidFile(t *testing.T) {
-	fh := createFileForTest(t)
-	path := fh.Name()
-	defer func() {
-		fh.Close()
-		os.Remove(path)
-	}()
+func TestDefault(t *testing.T) {
+	ctx := context.Background()
+	conf := &Cfg{IntValue: 10}
+	blfn := func(ctx context.Context, cfg config.Config) error {
+		conf, ok := cfg.Options().Struct.(*Cfg)
+		if !ok {
+			return fmt.Errorf("failed to get Struct from options: %v", cfg.Options())
+		}
+		conf.StringValue = "before_load"
+		return nil
+	}
+	alfn := func(ctx context.Context, cfg config.Config) error {
+		conf, ok := cfg.Options().Struct.(*Cfg)
+		if !ok {
+			return fmt.Errorf("failed to get Struct from options: %v", cfg.Options())
+		}
+		conf.StringValue = "after_load"
+		return nil
+	}
 
-	// Create new config
-	conf, err := NewConfig()
-	if err != nil {
-		t.Fatalf("Expected no error but got %v", err)
+	cfg := config.NewConfig(config.Struct(conf), config.BeforeLoad(blfn), config.AfterLoad(alfn))
+	if err := cfg.Init(); err != nil {
+		t.Fatal(err)
+	}
+	if err := cfg.Load(ctx); err != nil {
+		t.Fatal(err)
+	}
+	if conf.StringValue != "after_load" {
+		t.Fatal("AfterLoad option not working")
 	}
-	// Load file source
-	err = conf.Load(file.NewSource(
-		file.WithPath(path),
-		file.WithPath("/i/do/not/exists.json"),
-	))
 
-	if err == nil {
-		t.Fatal("Expected error but none !")
-	}
-	if !strings.Contains(fmt.Sprintf("%v", err), "/i/do/not/exists.json") {
-		t.Fatalf("Expected error to contain the unexisting file but got %v", err)
-	}
-}
-
-func TestConfigMerge(t *testing.T) {
-	fh := createFileForIssue18(t, `{
-  "amqp": {
-    "host": "rabbit.platform",
-    "port": 80
-  },
-  "handler": {
-    "exchange": "springCloudBus"
-  }
-}`)
-	path := fh.Name()
-	defer func() {
-		fh.Close()
-		os.Remove(path)
-	}()
-	os.Setenv("AMQP_HOST", "rabbit.testing.com")
-
-	conf, err := NewConfig()
-	if err != nil {
-		t.Fatalf("Expected no error but got %v", err)
-	}
-	if err := conf.Load(
-		file.NewSource(
-			file.WithPath(path),
-		),
-		env.NewSource(),
-	); err != nil {
-		t.Fatalf("Expected no error but got %v", err)
-	}
-
-	actualHost := conf.Get("amqp", "host").String("backup")
-	if actualHost != "rabbit.testing.com" {
-		t.Fatalf("Expected %v but got %v",
-			"rabbit.testing.com",
-			actualHost)
-	}
-}
-
-func equalS(t *testing.T, actual, expect string) {
-	if actual != expect {
-		t.Errorf("Expected %s but got %s", actual, expect)
-	}
-}
-
-func TestConfigWatcherDirtyOverrite(t *testing.T) {
-	n := runtime.GOMAXPROCS(0)
-	defer runtime.GOMAXPROCS(n)
-
-	runtime.GOMAXPROCS(1)
-
-	l := 100
-
-	ss := make([]source.Source, l)
-
-	for i := 0; i < l; i++ {
-		ss[i] = memory.NewSource(memory.WithJSON([]byte(fmt.Sprintf(`{"key%d": "val%d"}`, i, i))))
-	}
-
-	conf, _ := NewConfig()
-
-	for _, s := range ss {
-		_ = conf.Load(s)
-	}
-	runtime.Gosched()
-
-	for i := range ss {
-		k := fmt.Sprintf("key%d", i)
-		v := fmt.Sprintf("val%d", i)
-		equalS(t, conf.Get(k).String(""), v)
-	}
+	t.Logf("%#+v\n", conf)
 }

config/encoder/encoder.go

@@ -1,8 +0,0 @@
-// Package encoder handles source encoding formats
-package encoder
-
-type Encoder interface {
-	Encode(interface{}) ([]byte, error)
-	Decode([]byte, interface{}) error
-	String() string
-}

config/encoder/hcl/hcl.go

@@ -1,26 +0,0 @@
-package hcl
-
-import (
-	"encoding/json"
-
-	"github.com/hashicorp/hcl"
-	"github.com/unistack-org/micro/v3/config/encoder"
-)
-
-type hclEncoder struct{}
-
-func (h hclEncoder) Encode(v interface{}) ([]byte, error) {
-	return json.Marshal(v)
-}
-
-func (h hclEncoder) Decode(d []byte, v interface{}) error {
-	return hcl.Unmarshal(d, v)
-}
-
-func (h hclEncoder) String() string {
-	return "hcl"
-}
-
-func NewEncoder() encoder.Encoder {
-	return hclEncoder{}
-}

config/encoder/json/json.go

@@ -1,25 +0,0 @@
-package json
-
-import (
-	"encoding/json"
-
-	"github.com/unistack-org/micro/v3/config/encoder"
-)
-
-type jsonEncoder struct{}
-
-func (j jsonEncoder) Encode(v interface{}) ([]byte, error) {
-	return json.Marshal(v)
-}
-
-func (j jsonEncoder) Decode(d []byte, v interface{}) error {
-	return json.Unmarshal(d, v)
-}
-
-func (j jsonEncoder) String() string {
-	return "json"
-}
-
-func NewEncoder() encoder.Encoder {
-	return jsonEncoder{}
-}

config/encoder/toml/toml.go

@@ -1,32 +0,0 @@
-package toml
-
-import (
-	"bytes"
-
-	"github.com/BurntSushi/toml"
-	"github.com/unistack-org/micro/v3/config/encoder"
-)
-
-type tomlEncoder struct{}
-
-func (t tomlEncoder) Encode(v interface{}) ([]byte, error) {
-	b := bytes.NewBuffer(nil)
-	defer b.Reset()
-	err := toml.NewEncoder(b).Encode(v)
-	if err != nil {
-		return nil, err
-	}
-	return b.Bytes(), nil
-}
-
-func (t tomlEncoder) Decode(d []byte, v interface{}) error {
-	return toml.Unmarshal(d, v)
-}
-
-func (t tomlEncoder) String() string {
-	return "toml"
-}
-
-func NewEncoder() encoder.Encoder {
-	return tomlEncoder{}
-}

config/encoder/xml/xml.go

@@ -1,25 +0,0 @@
-package xml
-
-import (
-	"encoding/xml"
-
-	"github.com/unistack-org/micro/v3/config/encoder"
-)
-
-type xmlEncoder struct{}
-
-func (x xmlEncoder) Encode(v interface{}) ([]byte, error) {
-	return xml.Marshal(v)
-}
-
-func (x xmlEncoder) Decode(d []byte, v interface{}) error {
-	return xml.Unmarshal(d, v)
-}
-
-func (x xmlEncoder) String() string {
-	return "xml"
-}
-
-func NewEncoder() encoder.Encoder {
-	return xmlEncoder{}
-}

config/encoder/yaml/yaml.go

@@ -1,24 +0,0 @@
-package yaml
-
-import (
-	"github.com/ghodss/yaml"
-	"github.com/unistack-org/micro/v3/config/encoder"
-)
-
-type yamlEncoder struct{}
-
-func (y yamlEncoder) Encode(v interface{}) ([]byte, error) {
-	return yaml.Marshal(v)
-}
-
-func (y yamlEncoder) Decode(d []byte, v interface{}) error {
-	return yaml.Unmarshal(d, v)
-}
-
-func (y yamlEncoder) String() string {
-	return "yaml"
-}
-
-func NewEncoder() encoder.Encoder {
-	return yamlEncoder{}
-}

config/loader/loader.go

@@ -1,63 +0,0 @@
-// package loader manages loading from multiple sources
-package loader
-
-import (
-	"context"
-
-	"github.com/unistack-org/micro/v3/config/reader"
-	"github.com/unistack-org/micro/v3/config/source"
-)
-
-// Loader manages loading sources
-type Loader interface {
-	// Stop the loader
-	Close() error
-	// Load the sources
-	Load(...source.Source) error
-	// A Snapshot of loaded config
-	Snapshot() (*Snapshot, error)
-	// Force sync of sources
-	Sync() error
-	// Watch for changes
-	Watch(...string) (Watcher, error)
-	// Name of loader
-	String() string
-}
-
-// Watcher lets you watch sources and returns a merged ChangeSet
-type Watcher interface {
-	// First call to next may return the current Snapshot
-	// If you are watching a path then only the data from
-	// that path is returned.
-	Next() (*Snapshot, error)
-	// Stop watching for changes
-	Stop() error
-}
-
-// Snapshot is a merged ChangeSet
-type Snapshot struct {
-	// The merged ChangeSet
-	ChangeSet *source.ChangeSet
-	// Deterministic and comparable version of the snapshot
-	Version string
-}
-
-type Options struct {
-	Reader reader.Reader
-	Source []source.Source
-
-	// for alternative data
-	Context context.Context
-}
-
-type Option func(o *Options)
-
-// Copy snapshot
-func Copy(s *Snapshot) *Snapshot {
-	cs := *(s.ChangeSet)
-
-	return &Snapshot{
-		ChangeSet: &cs,
-		Version:   s.Version,
-	}
-}

config/options.go

@@ -1,28 +1,126 @@
 package config
 
 import (
-	"github.com/unistack-org/micro/v3/config/loader"
-	"github.com/unistack-org/micro/v3/config/reader"
-	"github.com/unistack-org/micro/v3/config/source"
+	"context"
+
+	"github.com/unistack-org/micro/v3/codec"
+	"github.com/unistack-org/micro/v3/logger"
+	"github.com/unistack-org/micro/v3/meter"
+	"github.com/unistack-org/micro/v3/tracer"
 )
 
-// WithLoader sets the loader for manager config
-func WithLoader(l loader.Loader) Option {
+type Options struct {
+	Name       string
+	AllowFail  bool
+	BeforeLoad []func(context.Context, Config) error
+	AfterLoad  []func(context.Context, Config) error
+	BeforeSave []func(context.Context, Config) error
+	AfterSave  []func(context.Context, Config) error
+	// Struct that holds config data
+	Struct interface{}
+	// StructTag name
+	StructTag string
+	// Logger that will be used
+	Logger logger.Logger
+	// Meter that will be used
+	Meter meter.Meter
+	// Tracer used for trace
+	Tracer tracer.Tracer
+	// Codec that used for load/save
+	Codec codec.Codec
+	// Context for alternative data
+	Context context.Context
+}
+
+type Option func(o *Options)
+
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Logger:  logger.DefaultLogger,
+		Meter:   meter.DefaultMeter,
+		Tracer:  tracer.DefaultTracer,
+		Context: context.Background(),
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
+}
+
+func AllowFail(b bool) Option {
 	return func(o *Options) {
-		o.Loader = l
+		o.AllowFail = b
 	}
 }
 
-// WithSource appends a source to list of sources
-func WithSource(s source.Source) Option {
+func BeforeLoad(fn ...func(context.Context, Config) error) Option {
 	return func(o *Options) {
-		o.Source = append(o.Source, s)
+		o.BeforeLoad = fn
 	}
 }
 
-// WithReader sets the config reader
-func WithReader(r reader.Reader) Option {
+func AfterLoad(fn ...func(context.Context, Config) error) Option {
 	return func(o *Options) {
-		o.Reader = r
+		o.AfterLoad = fn
+	}
+}
+
+func BeforeSave(fn ...func(context.Context, Config) error) Option {
+	return func(o *Options) {
+		o.BeforeSave = fn
+	}
+}
+
+func AfterSave(fn ...func(context.Context, Config) error) Option {
+	return func(o *Options) {
+		o.AfterSave = fn
+	}
+}
+
+func Context(ctx context.Context) Option {
+	return func(o *Options) {
+		o.Context = ctx
+	}
+}
+
+// Codec sets the source codec
+func Codec(c codec.Codec) Option {
+	return func(o *Options) {
+		o.Codec = c
+	}
+}
+
+func Logger(l logger.Logger) Option {
+	return func(o *Options) {
+		o.Logger = l
+	}
+}
+
+// Tracer to be used for tracing
+func Tracer(t tracer.Tracer) Option {
+	return func(o *Options) {
+		o.Tracer = t
+	}
+}
+
+// Struct used as config
+func Struct(v interface{}) Option {
+	return func(o *Options) {
+		o.Struct = v
+	}
+}
+
+// StructTag
+func StructTag(name string) Option {
+	return func(o *Options) {
+		o.StructTag = name
+	}
+}
+
+// Name sets the name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
 	}
 }

config/reader/options.go

@@ -1,50 +0,0 @@
-package reader
-
-import (
-	"github.com/unistack-org/micro/v3/config/encoder"
-	"github.com/unistack-org/micro/v3/config/encoder/hcl"
-	"github.com/unistack-org/micro/v3/config/encoder/json"
-	"github.com/unistack-org/micro/v3/config/encoder/toml"
-	"github.com/unistack-org/micro/v3/config/encoder/xml"
-	"github.com/unistack-org/micro/v3/config/encoder/yaml"
-)
-
-type Options struct {
-	Encoding              map[string]encoder.Encoder
-	DisableReplaceEnvVars bool
-}
-
-type Option func(o *Options)
-
-func NewOptions(opts ...Option) Options {
-	options := Options{
-		Encoding: map[string]encoder.Encoder{
-			"json": json.NewEncoder(),
-			"yaml": yaml.NewEncoder(),
-			"toml": toml.NewEncoder(),
-			"xml":  xml.NewEncoder(),
-			"hcl":  hcl.NewEncoder(),
-			"yml":  yaml.NewEncoder(),
-		},
-	}
-	for _, o := range opts {
-		o(&options)
-	}
-	return options
-}
-
-func WithEncoder(e encoder.Encoder) Option {
-	return func(o *Options) {
-		if o.Encoding == nil {
-			o.Encoding = make(map[string]encoder.Encoder)
-		}
-		o.Encoding[e.String()] = e
-	}
-}
-
-// WithDisableReplaceEnvVars disables the environment variable interpolation preprocessor
-func WithDisableReplaceEnvVars() Option {
-	return func(o *Options) {
-		o.DisableReplaceEnvVars = true
-	}
-}

config/reader/preprocessor.go

@@ -1,23 +0,0 @@
-package reader
-
-import (
-	"os"
-	"regexp"
-)
-
-func ReplaceEnvVars(raw []byte) ([]byte, error) {
-	re := regexp.MustCompile(`\$\{([A-Za-z0-9_]+)\}`)
-	if re.Match(raw) {
-		dataS := string(raw)
-		res := re.ReplaceAllStringFunc(dataS, replaceEnvVars)
-		return []byte(res), nil
-	} else {
-		return raw, nil
-	}
-}
-
-func replaceEnvVars(element string) string {
-	v := element[2 : len(element)-1]
-	el := os.Getenv(v)
-	return el
-}

config/reader/preprocessor_test.go

@@ -1,73 +0,0 @@
-package reader
-
-import (
-	"os"
-	"strings"
-	"testing"
-)
-
-func TestReplaceEnvVars(t *testing.T) {
-	os.Setenv("myBar", "cat")
-	os.Setenv("MYBAR", "cat")
-	os.Setenv("my_Bar", "cat")
-	os.Setenv("myBar_", "cat")
-
-	testData := []struct {
-		expected string
-		data     []byte
-	}{
-		// Right use cases
-		{
-			`{"foo": "bar", "baz": {"bar": "cat"}}`,
-			[]byte(`{"foo": "bar", "baz": {"bar": "${myBar}"}}`),
-		},
-		{
-			`{"foo": "bar", "baz": {"bar": "cat"}}`,
-			[]byte(`{"foo": "bar", "baz": {"bar": "${MYBAR}"}}`),
-		},
-		{
-			`{"foo": "bar", "baz": {"bar": "cat"}}`,
-			[]byte(`{"foo": "bar", "baz": {"bar": "${my_Bar}"}}`),
-		},
-		{
-			`{"foo": "bar", "baz": {"bar": "cat"}}`,
-			[]byte(`{"foo": "bar", "baz": {"bar": "${myBar_}"}}`),
-		},
-		// Wrong use cases
-		{
-			`{"foo": "bar", "baz": {"bar": "${myBar-}"}}`,
-			[]byte(`{"foo": "bar", "baz": {"bar": "${myBar-}"}}`),
-		},
-		{
-			`{"foo": "bar", "baz": {"bar": "${}"}}`,
-			[]byte(`{"foo": "bar", "baz": {"bar": "${}"}}`),
-		},
-		{
-			`{"foo": "bar", "baz": {"bar": "$sss}"}}`,
-			[]byte(`{"foo": "bar", "baz": {"bar": "$sss}"}}`),
-		},
-		{
-			`{"foo": "bar", "baz": {"bar": "${sss"}}`,
-			[]byte(`{"foo": "bar", "baz": {"bar": "${sss"}}`),
-		},
-		{
-			`{"foo": "bar", "baz": {"bar": "{something}"}}`,
-			[]byte(`{"foo": "bar", "baz": {"bar": "{something}"}}`),
-		},
-		// Use cases without replace env vars
-		{
-			`{"foo": "bar", "baz": {"bar": "cat"}}`,
-			[]byte(`{"foo": "bar", "baz": {"bar": "cat"}}`),
-		},
-	}
-
-	for _, test := range testData {
-		res, err := ReplaceEnvVars(test.data)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if strings.Compare(test.expected, string(res)) != 0 {
-			t.Fatalf("Expected %s got %s", test.expected, res)
-		}
-	}
-}

config/reader/reader.go

@@ -1,38 +0,0 @@
-// Package reader parses change sets and provides config values
-package reader
-
-import (
-	"time"
-
-	"github.com/unistack-org/micro/v3/config/source"
-)
-
-// Reader is an interface for merging changesets
-type Reader interface {
-	Merge(...*source.ChangeSet) (*source.ChangeSet, error)
-	Values(*source.ChangeSet) (Values, error)
-	String() string
-}
-
-// Values is returned by the reader
-type Values interface {
-	Bytes() []byte
-	Get(path ...string) (Value, error)
-	Set(val interface{}, path ...string) error
-	Del(path ...string) error
-	Map() map[string]interface{}
-	Scan(v interface{}) error
-}
-
-// Value represents a value of any type
-type Value interface {
-	Bool(def bool) bool
-	Int(def int) int
-	String(def string) string
-	Float64(def float64) float64
-	Duration(def time.Duration) time.Duration
-	StringSlice(def []string) []string
-	StringMap(def map[string]string) map[string]string
-	Scan(val interface{}) error
-	Bytes() []byte
-}

config/reflect_test.go

@@ -0,0 +1,26 @@
+package config_test
+
+import (
+	"testing"
+
+	rutil "github.com/unistack-org/micro/v3/util/reflect"
+)
+
+type Config struct {
+	Value     string
+	SubConfig *SubConfig
+	Config    *Config
+}
+
+type SubConfig struct {
+	Value string
+}
+
+func TestReflect(t *testing.T) {
+	cfg1 := &Config{Value: "cfg1", Config: &Config{Value: "cfg1_1"}, SubConfig: &SubConfig{Value: "cfg1"}}
+	cfg2, err := rutil.Zero(cfg1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("dst: %#+v\n", cfg2)
+}

config/source/changeset.go

@@ -1,13 +0,0 @@
-package source
-
-import (
-	"crypto/md5"
-	"fmt"
-)
-
-// Sum returns the md5 checksum of the ChangeSet data
-func (c *ChangeSet) Sum() string {
-	h := md5.New()
-	h.Write(c.Data)
-	return fmt.Sprintf("%x", h.Sum(nil))
-}

config/source/noop.go

@@ -1,25 +0,0 @@
-package source
-
-import (
-	"errors"
-)
-
-type noopWatcher struct {
-	exit chan struct{}
-}
-
-func (w *noopWatcher) Next() (*ChangeSet, error) {
-	<-w.exit
-
-	return nil, errors.New("noopWatcher stopped")
-}
-
-func (w *noopWatcher) Stop() error {
-	close(w.exit)
-	return nil
-}
-
-// NewNoopWatcher returns a watcher that blocks on Next() until Stop() is called.
-func NewNoopWatcher() (Watcher, error) {
-	return &noopWatcher{exit: make(chan struct{})}, nil
-}

config/source/options.go

@@ -1,49 +0,0 @@
-package source
-
-import (
-	"context"
-
-	"github.com/unistack-org/micro/v3/client"
-	"github.com/unistack-org/micro/v3/config/encoder"
-	"github.com/unistack-org/micro/v3/config/encoder/json"
-)
-
-type Options struct {
-	// Encoder
-	Encoder encoder.Encoder
-
-	// for alternative data
-	Context context.Context
-
-	// Client to use for RPC
-	Client client.Client
-}
-
-type Option func(o *Options)
-
-func NewOptions(opts ...Option) Options {
-	options := Options{
-		Encoder: json.NewEncoder(),
-		Context: context.Background(),
-	}
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	return options
-}
-
-// WithEncoder sets the source encoder
-func WithEncoder(e encoder.Encoder) Option {
-	return func(o *Options) {
-		o.Encoder = e
-	}
-}
-
-// WithClient sets the source client
-func WithClient(c client.Client) Option {
-	return func(o *Options) {
-		o.Client = c
-	}
-}

config/source/source.go

@@ -1,35 +0,0 @@
-// Package source is the interface for sources
-package source
-
-import (
-	"errors"
-	"time"
-)
-
-var (
-	// ErrWatcherStopped is returned when source watcher has been stopped
-	ErrWatcherStopped = errors.New("watcher stopped")
-)
-
-// Source is the source from which config is loaded
-type Source interface {
-	Read() (*ChangeSet, error)
-	Write(*ChangeSet) error
-	Watch() (Watcher, error)
-	String() string
-}
-
-// ChangeSet represents a set of changes from a source
-type ChangeSet struct {
-	Data      []byte
-	Checksum  string
-	Format    string
-	Source    string
-	Timestamp time.Time
-}
-
-// Watcher watches a source for changes
-type Watcher interface {
-	Next() (*ChangeSet, error)
-	Stop() error
-}

config/value.go

@@ -1,49 +0,0 @@
-package config
-
-import (
-	"time"
-
-	"github.com/unistack-org/micro/v3/config/reader"
-)
-
-type value struct{}
-
-func newValue() reader.Value {
-	return new(value)
-}
-
-func (v *value) Bool(def bool) bool {
-	return false
-}
-
-func (v *value) Int(def int) int {
-	return 0
-}
-
-func (v *value) String(def string) string {
-	return ""
-}
-
-func (v *value) Float64(def float64) float64 {
-	return 0.0
-}
-
-func (v *value) Duration(def time.Duration) time.Duration {
-	return time.Duration(0)
-}
-
-func (v *value) StringSlice(def []string) []string {
-	return nil
-}
-
-func (v *value) StringMap(def map[string]string) map[string]string {
-	return map[string]string{}
-}
-
-func (v *value) Scan(val interface{}) error {
-	return nil
-}
-
-func (v *value) Bytes() []byte {
-	return nil
-}

context.go

@@ -0,0 +1,22 @@
+package micro
+
+import "context"
+
+type serviceKey struct{}
+
+// FromContext retrieves a Service from the Context.
+func FromContext(ctx context.Context) (Service, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	s, ok := ctx.Value(serviceKey{}).(Service)
+	return s, ok
+}
+
+// NewContext returns a new Context with the Service embedded within it.
+func NewContext(ctx context.Context, s Service) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, serviceKey{}, s)
+}

debug/log/kubernetes/kubernetes.go

@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"github.com/unistack-org/micro/v3/debug/log"
+	"github.com/unistack-org/micro/v3/metadata"
 	"github.com/unistack-org/micro/v3/util/kubernetes/client"
 )
 
@@ -89,7 +90,7 @@ func (k *klog) parse(line string) log.Record {
 	if err := json.Unmarshal([]byte(line), &record); err != nil {
 		record.Timestamp = time.Now().UTC()
 		record.Message = line
-		record.Metadata = make(map[string]string)
+		record.Metadata = metadata.New(1)
 	}
 
 	record.Metadata["service"] = k.Options.Name

debug/log/log.go

@@ -5,6 +5,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"time"
+
+	"github.com/unistack-org/micro/v3/metadata"
 )
 
 var (
@@ -29,7 +31,7 @@ type Record struct {
 	// Timestamp of logged event
 	Timestamp time.Time `json:"timestamp"`
 	// Metadata to enrich log record
-	Metadata map[string]string `json:"metadata"`
+	Metadata metadata.Metadata `json:"metadata"`
 	// Value contains log entry
 	Message interface{} `json:"message"`
 }

errors/errors.go

@@ -9,18 +9,30 @@ import (
 )
 
 var (
-	ErrBadRequest          = &Error{Code: 400}
-	ErrUnauthorized        = &Error{Code: 401}
-	ErrForbidden           = &Error{Code: 403}
-	ErrNotFound            = &Error{Code: 404}
-	ErrMethodNotAllowed    = &Error{Code: 405}
-	ErrTimeout             = &Error{Code: 408}
-	ErrConflict            = &Error{Code: 409}
+	// ErrBadRequest
+	ErrBadRequest = &Error{Code: 400}
+	// ErrUnauthorized
+	ErrUnauthorized = &Error{Code: 401}
+	// ErrForbidden
+	ErrForbidden = &Error{Code: 403}
+	// ErrNotFound
+	ErrNotFound = &Error{Code: 404}
+	// ErrMethodNotAllowed
+	ErrMethodNotAllowed = &Error{Code: 405}
+	// ErrTimeout
+	ErrTimeout = &Error{Code: 408}
+	// ErrConflict
+	ErrConflict = &Error{Code: 409}
+	// ErrInternalServerError
 	ErrInternalServerError = &Error{Code: 500}
-	ErNotImplemented       = &Error{Code: 501}
-	ErrBadGateway          = &Error{Code: 502}
-	ErrServiceUnavailable  = &Error{Code: 503}
-	ErrGatewayTimeout      = &Error{Code: 504}
+	// ErNotImplemented
+	ErNotImplemented = &Error{Code: 501}
+	// ErrBadGateway
+	ErrBadGateway = &Error{Code: 502}
+	// ErrServiceUnavailable
+	ErrServiceUnavailable = &Error{Code: 503}
+	// ErrGatewayTimeout
+	ErrGatewayTimeout = &Error{Code: 504}
 )
 
 // Error tpye

event.go

@@ -6,11 +6,22 @@ import (
 	"github.com/unistack-org/micro/v3/client"
 )
 
+// Event is used to publish messages to a topic
+type Event interface {
+	// Publish publishes a message to the event topic
+	Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error
+}
+
 type event struct {
 	c     client.Client
 	topic string
 }
 
+// NewEvent creates a new event publisher
+func NewEvent(topic string, c client.Client) Event {
+	return &event{c, topic}
+}
+
 func (e *event) Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error {
 	return e.c.Publish(ctx, e.c.NewMessage(e.topic, msg), opts...)
 }

events/events.go

@@ -6,6 +6,8 @@ import (
 	"encoding/json"
 	"errors"
 	"time"
+
+	"github.com/unistack-org/micro/v3/metadata"
 )
 
 var (
@@ -31,12 +33,12 @@ type Store interface {
 type Event struct {
 	// ID to uniquely identify the event
 	ID string
-	// Topic of event, e.g. "registry.service.created"
+	// Topic of event, e.g. "register.service.created"
 	Topic string
 	// Timestamp of the event
 	Timestamp time.Time
 	// Metadata contains the encoded event was indexed by
-	Metadata map[string]string
+	Metadata metadata.Metadata
 	// Payload contains the encoded message
 	Payload []byte
 }

events/options.go

@@ -1,11 +1,15 @@
 package events
 
-import "time"
+import (
+	"time"
+
+	"github.com/unistack-org/micro/v3/metadata"
+)
 
 // PublishOptions contains all the options which can be provided when publishing an event
 type PublishOptions struct {
 	// Metadata contains any keys which can be used to query the data, for example a customer id
-	Metadata map[string]string
+	Metadata metadata.Metadata
 	// Timestamp to set for the event, if the timestamp is a zero value, the current time will be used
 	Timestamp time.Time
 }
@@ -14,9 +18,9 @@ type PublishOptions struct {
 type PublishOption func(o *PublishOptions)
 
 // WithMetadata sets the Metadata field on PublishOptions
-func WithMetadata(md map[string]string) PublishOption {
+func WithMetadata(md metadata.Metadata) PublishOption {
 	return func(o *PublishOptions) {
-		o.Metadata = md
+		o.Metadata = metadata.Copy(md)
 	}
 }
 

function.go

@@ -1,3 +1,5 @@
+// +build ignore
+
 package micro
 
 import (
@@ -7,11 +9,28 @@ import (
 	"github.com/unistack-org/micro/v3/server"
 )
 
+// Function is a one time executing Service
+type Function interface {
+	// Inherits Service interface
+	Service
+	// Done signals to complete execution
+	Done() error
+	// Handle registers an RPC handler
+	Handle(v interface{}) error
+	// Subscribe registers a subscriber
+	Subscribe(topic string, v interface{}) error
+}
+
 type function struct {
 	cancel context.CancelFunc
 	Service
 }
 
+// NewFunction returns a new Function for a one time executing Service
+func NewFunction(opts ...Option) Function {
+	return newFunction(opts...)
+}
+
 func fnHandlerWrapper(f Function) server.HandlerWrapper {
 	return func(h server.HandlerFunc) server.HandlerFunc {
 		return func(ctx context.Context, req server.Request, rsp interface{}) error {
@@ -45,7 +64,7 @@ func newFunction(opts ...Option) Function {
 	// make context the last thing
 	fopts = append(fopts, Context(ctx))
 
-	service := newService(fopts...)
+	service := &service{opts: NewOptions(opts...)}
 
 	fn := &function{
 		cancel:  cancel,

function_test.go

@@ -7,18 +7,18 @@ import (
 	"sync"
 	"testing"
 
-	rmemory "github.com/unistack-org/micro-registry-memory"
+	rmemory "github.com/unistack-org/micro-register-memory"
 )
 
 func TestFunction(t *testing.T) {
 	var wg sync.WaitGroup
 	wg.Add(1)
 
-	r := rmemory.NewRegistry()
+	r := rmemory.NewRegister()
 
 	// create service
 	fn := NewFunction(
-		Registry(r),
+		Register(r),
 		Name("test.function"),
 		AfterStart(func() error {
 			wg.Done()

go.mod

@@ -3,31 +3,20 @@ module github.com/unistack-org/micro/v3
 go 1.14
 
 require (
-	github.com/BurntSushi/toml v0.3.1
-	github.com/caddyserver/certmagic v0.10.6
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
-	github.com/ef-ds/deque v1.0.4-0.20190904040645-54cb57c252a1
-	github.com/evanphx/json-patch/v5 v5.1.0
-	github.com/ghodss/yaml v1.0.0
-	github.com/go-acme/lego/v3 v3.4.0
-	github.com/gobwas/httphead v0.0.0-20180130184737-2c6c146eadee
-	github.com/gobwas/ws v1.0.3
+	github.com/ef-ds/deque v1.0.4
 	github.com/golang/protobuf v1.4.3
-	github.com/google/uuid v1.1.2
-	github.com/hashicorp/hcl v1.0.0
-	github.com/micro/cli/v2 v2.1.2
-	github.com/miekg/dns v1.1.31
+	github.com/google/uuid v1.1.5
+	github.com/imdario/mergo v0.3.11
+	github.com/kr/text v0.2.0 // indirect
+	github.com/miekg/dns v1.1.35
+	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c
-	github.com/patrickmn/go-cache v2.1.0+incompatible
-	github.com/stretchr/testify v1.5.1
-	github.com/unistack-org/micro-codec-bytes v0.0.0-20200828083432-4e49e953d844
-	github.com/unistack-org/micro-codec-json v0.0.0-20201102222734-a29c895ec05c
-	github.com/unistack-org/micro-codec-jsonrpc v0.0.0-20201102222451-ff6a69988bcd
-	github.com/unistack-org/micro-codec-proto v0.0.0-20201102222202-769c2d6a4b92
-	github.com/unistack-org/micro-codec-protorpc v0.0.0-20201102222610-3a343898c077
-	github.com/unistack-org/micro-config-cmd v0.0.0-20201028144621-5a55f1aad70a
-	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
-	golang.org/x/net v0.0.0-20200904194848-62affa334b73
-	google.golang.org/genproto v0.0.0-20200904004341-0bd0a958aa1d
+	github.com/stretchr/testify v1.7.0
+	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
+	golang.org/x/net v0.0.0-20201224014010-6772e930b67b
+	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e // indirect
 	google.golang.org/protobuf v1.25.0
+	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 )

go.sum

@@ -1,479 +1,110 @@
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-google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.19.1/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
-google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
-google.golang.org/grpc v1.27.0 h1:rRYRFMVgRv6E0D70Skyfsr28tDXIuuPZyWGMPdMcnXg=
 google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
@@ -483,40 +114,14 @@ google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzi
 google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
 google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
-gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/h2non/gock.v1 v1.0.15/go.mod h1:sX4zAkdYX1TRGJ2JY156cFspQn4yRWn6p9EMdODlynE=
-gopkg.in/ini.v1 v1.42.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
-gopkg.in/ini.v1 v1.44.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
-gopkg.in/ns1/ns1-go.v2 v2.0.0-20190730140822-b51389932cbc/go.mod h1:VV+3haRsgDiVLxyifmMBrBIuCWFBPYKbRssXB9z67Hw=
-gopkg.in/resty.v1 v1.9.1/go.mod h1:vo52Hzryw9PnPHcJfPsBiFW62XhNx5OczbV9y+IMpgc=
-gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
-gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
-gopkg.in/square/go-jose.v2 v2.4.1 h1:H0TmLt7/KmzlrDOpa1F+zr0Tk90PbJYBfsVUmRLrf9Y=
-gopkg.in/square/go-jose.v2 v2.4.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=

logger/context.go

@@ -6,11 +6,27 @@ type loggerKey struct{}
 
 // FromContext returns logger from passed context
 func FromContext(ctx context.Context) (Logger, bool) {
+	if ctx == nil {
+		return nil, false
+	}
 	l, ok := ctx.Value(loggerKey{}).(Logger)
 	return l, ok
 }
 
 // NewContext stores logger into passed context
 func NewContext(ctx context.Context, l Logger) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
 	return context.WithValue(ctx, loggerKey{}, l)
 }
+
+// SetOption returns a function to setup a context with given value
+func SetOption(k, v interface{}) Option {
+	return func(o *Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

logger/level.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 )
 
+// Level means logger level
 type Level int8
 
 const (
@@ -11,17 +12,17 @@ const (
 	TraceLevel Level = iota - 2
 	// DebugLevel level. Usually only enabled when debugging. Very verbose logging.
 	DebugLevel
-	// InfoLevel is the default logging priority.
-	// General operational entries about what's going on inside the application.
+	// InfoLevel level. General operational entries about what's going on inside the application.
 	InfoLevel
 	// WarnLevel level. Non-critical entries that deserve eyes.
 	WarnLevel
-	// ErrorLevel level. Logs. Used for errors that should definitely be noted.
+	// ErrorLevel level. Used for errors that should definitely be noted.
 	ErrorLevel
 	// FatalLevel level. Logs and then calls `os.Exit(1)`. highest level of severity.
 	FatalLevel
 )
 
+// String returns logger level string representation
 func (l Level) String() string {
 	switch l {
 	case TraceLevel:

logger/logger.go

@@ -1,9 +1,13 @@
 // Package logger provides a log interface
 package logger
 
+import "context"
+
 var (
 	// DefaultLogger variable
 	DefaultLogger Logger = NewLogger()
+	// DefaultLogger level
+	DefaultLevel Level = InfoLevel
 )
 
 // Logger is a generic logging interface
@@ -17,81 +21,98 @@ type Logger interface {
 	// Fields set fields to always be logged
 	Fields(fields map[string]interface{}) Logger
 	// Info level message
-	Info(args ...interface{})
+	Info(ctx context.Context, args ...interface{})
 	// Trace level message
-	Trace(args ...interface{})
+	Trace(ctx context.Context, args ...interface{})
 	// Debug level message
-	Debug(args ...interface{})
+	Debug(ctx context.Context, args ...interface{})
 	// Warn level message
-	Warn(args ...interface{})
+	Warn(ctx context.Context, args ...interface{})
 	// Error level message
-	Error(args ...interface{})
+	Error(ctx context.Context, args ...interface{})
 	// Fatal level message
-	Fatal(args ...interface{})
+	Fatal(ctx context.Context, args ...interface{})
 	// Infof level message
-	Infof(msg string, args ...interface{})
+	Infof(ctx context.Context, msg string, args ...interface{})
 	// Tracef level message
-	Tracef(msg string, args ...interface{})
+	Tracef(ctx context.Context, msg string, args ...interface{})
 	// Debug level message
-	Debugf(msg string, args ...interface{})
+	Debugf(ctx context.Context, msg string, args ...interface{})
 	// Warn level message
-	Warnf(msg string, args ...interface{})
+	Warnf(ctx context.Context, msg string, args ...interface{})
 	// Error level message
-	Errorf(msg string, args ...interface{})
+	Errorf(ctx context.Context, msg string, args ...interface{})
 	// Fatal level message
-	Fatalf(msg string, args ...interface{})
+	Fatalf(ctx context.Context, msg string, args ...interface{})
+	// Log logs message with needed level
+	Log(ctx context.Context, level Level, args ...interface{})
+	// Logf logs message with needed level
+	Logf(ctx context.Context, level Level, msg string, args ...interface{})
 	// String returns the name of logger
 	String() string
 }
 
-func Info(args ...interface{}) {
-	DefaultLogger.Info(args...)
+// Info writes msg to default logger on info level
+func Info(ctx context.Context, args ...interface{}) {
+	DefaultLogger.Info(ctx, args...)
 }
 
-func Error(args ...interface{}) {
-	DefaultLogger.Error(args...)
+// Error writes msg to default logger on error level
+func Error(ctx context.Context, args ...interface{}) {
+	DefaultLogger.Error(ctx, args...)
 }
 
-func Debug(args ...interface{}) {
-	DefaultLogger.Debug(args...)
+// Debug writes msg to default logger on debug level
+func Debug(ctx context.Context, args ...interface{}) {
+	DefaultLogger.Debug(ctx, args...)
 }
 
-func Warn(args ...interface{}) {
-	DefaultLogger.Warn(args...)
+// Warn writes msg to default logger on warn level
+func Warn(ctx context.Context, args ...interface{}) {
+	DefaultLogger.Warn(ctx, args...)
 }
 
-func Trace(args ...interface{}) {
-	DefaultLogger.Trace(args...)
+// Trace writes msg to default logger on trace level
+func Trace(ctx context.Context, args ...interface{}) {
+	DefaultLogger.Trace(ctx, args...)
 }
 
-func Fatal(args ...interface{}) {
-	DefaultLogger.Fatal(args...)
+// Fatal writes msg to default logger on fatal level
+func Fatal(ctx context.Context, args ...interface{}) {
+	DefaultLogger.Fatal(ctx, args...)
 }
 
-func Infof(msg string, args ...interface{}) {
-	DefaultLogger.Infof(msg, args...)
+// Infof writes formatted msg to default logger on info level
+func Infof(ctx context.Context, msg string, args ...interface{}) {
+	DefaultLogger.Infof(ctx, msg, args...)
 }
 
-func Errorf(msg string, args ...interface{}) {
-	DefaultLogger.Errorf(msg, args...)
+// Errorf writes formatted msg to default logger on error level
+func Errorf(ctx context.Context, msg string, args ...interface{}) {
+	DefaultLogger.Errorf(ctx, msg, args...)
 }
 
-func Debugf(msg string, args ...interface{}) {
-	DefaultLogger.Debugf(msg, args...)
+// Debugf writes formatted msg to default logger on debug level
+func Debugf(ctx context.Context, msg string, args ...interface{}) {
+	DefaultLogger.Debugf(ctx, msg, args...)
 }
 
-func Warnf(msg string, args ...interface{}) {
-	DefaultLogger.Warnf(msg, args...)
+// Warnf writes formatted msg to default logger on warn level
+func Warnf(ctx context.Context, msg string, args ...interface{}) {
+	DefaultLogger.Warnf(ctx, msg, args...)
 }
 
-func Tracef(msg string, args ...interface{}) {
-	DefaultLogger.Tracef(msg, args...)
+// Tracef writes formatted msg to default logger on trace level
+func Tracef(ctx context.Context, msg string, args ...interface{}) {
+	DefaultLogger.Tracef(ctx, msg, args...)
 }
 
-func Fatalf(msg string, args ...interface{}) {
-	DefaultLogger.Fatalf(msg, args...)
+// Fatalf writes formatted msg to default logger on fatal level
+func Fatalf(ctx context.Context, msg string, args ...interface{}) {
+	DefaultLogger.Fatalf(ctx, msg, args...)
 }
 
+// V returns true if passed level enabled in default logger
 func V(level Level) bool {
 	return DefaultLogger.V(level)
 }

logger/logger_test.go

@@ -1,16 +1,18 @@
 package logger
 
 import (
+	"context"
 	"testing"
 )
 
 func TestLogger(t *testing.T) {
+	ctx := context.TODO()
 	l := NewLogger(WithLevel(TraceLevel))
 	if err := l.Init(); err != nil {
 		t.Fatal(err)
 	}
-	l.Trace("trace_msg1")
-	l.Warn("warn_msg1")
-	l.Fields(map[string]interface{}{"error": "test"}).Info("error message")
-	l.Warn("first", " ", "second")
+	l.Trace(ctx, "trace_msg1")
+	l.Warn(ctx, "warn_msg1")
+	l.Fields(map[string]interface{}{"error": "test"}).Info(ctx, "error message")
+	l.Warn(ctx, "first", " ", "second")
 }

logger/micro.go

@@ -1,6 +1,7 @@
 package logger
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"os"
@@ -28,12 +29,11 @@ type defaultLogger struct {
 // Init(opts...) should only overwrite provided options
 func (l *defaultLogger) Init(opts ...Option) error {
 	l.Lock()
-	defer l.Unlock()
-
 	for _, o := range opts {
 		o(&l.opts)
 	}
 	l.enc = json.NewEncoder(l.opts.Out)
+	l.Unlock()
 	return nil
 }
 
@@ -42,7 +42,10 @@ func (l *defaultLogger) String() string {
 }
 
 func (l *defaultLogger) V(level Level) bool {
-	return l.opts.Level.Enabled(level)
+	l.RLock()
+	ok := l.opts.Level.Enabled(level)
+	l.RUnlock()
+	return ok
 }
 
 func (l *defaultLogger) Fields(fields map[string]interface{}) Logger {
@@ -84,57 +87,57 @@ func logCallerfilePath(loggingFilePath string) string {
 	return loggingFilePath[idx+1:]
 }
 
-func (l *defaultLogger) Info(args ...interface{}) {
-	l.log(InfoLevel, args...)
+func (l *defaultLogger) Info(ctx context.Context, args ...interface{}) {
+	l.Log(ctx, InfoLevel, args...)
 }
 
-func (l *defaultLogger) Error(args ...interface{}) {
-	l.log(ErrorLevel, args...)
+func (l *defaultLogger) Error(ctx context.Context, args ...interface{}) {
+	l.Log(ctx, ErrorLevel, args...)
 }
 
-func (l *defaultLogger) Debug(args ...interface{}) {
-	l.log(DebugLevel, args...)
+func (l *defaultLogger) Debug(ctx context.Context, args ...interface{}) {
+	l.Log(ctx, DebugLevel, args...)
 }
 
-func (l *defaultLogger) Warn(args ...interface{}) {
-	l.log(WarnLevel, args...)
+func (l *defaultLogger) Warn(ctx context.Context, args ...interface{}) {
+	l.Log(ctx, WarnLevel, args...)
 }
 
-func (l *defaultLogger) Trace(args ...interface{}) {
-	l.log(TraceLevel, args...)
+func (l *defaultLogger) Trace(ctx context.Context, args ...interface{}) {
+	l.Log(ctx, TraceLevel, args...)
 }
 
-func (l *defaultLogger) Fatal(args ...interface{}) {
-	l.log(FatalLevel, args...)
+func (l *defaultLogger) Fatal(ctx context.Context, args ...interface{}) {
+	l.Log(ctx, FatalLevel, args...)
 	os.Exit(1)
 }
 
-func (l *defaultLogger) Infof(msg string, args ...interface{}) {
-	l.logf(InfoLevel, msg, args...)
+func (l *defaultLogger) Infof(ctx context.Context, msg string, args ...interface{}) {
+	l.Logf(ctx, InfoLevel, msg, args...)
 }
 
-func (l *defaultLogger) Errorf(msg string, args ...interface{}) {
-	l.logf(ErrorLevel, msg, args...)
+func (l *defaultLogger) Errorf(ctx context.Context, msg string, args ...interface{}) {
+	l.Logf(ctx, ErrorLevel, msg, args...)
 }
 
-func (l *defaultLogger) Debugf(msg string, args ...interface{}) {
-	l.logf(DebugLevel, msg, args...)
+func (l *defaultLogger) Debugf(ctx context.Context, msg string, args ...interface{}) {
+	l.Logf(ctx, DebugLevel, msg, args...)
 }
 
-func (l *defaultLogger) Warnf(msg string, args ...interface{}) {
-	l.logf(WarnLevel, msg, args...)
+func (l *defaultLogger) Warnf(ctx context.Context, msg string, args ...interface{}) {
+	l.Logf(ctx, WarnLevel, msg, args...)
 }
 
-func (l *defaultLogger) Tracef(msg string, args ...interface{}) {
-	l.logf(TraceLevel, msg, args...)
+func (l *defaultLogger) Tracef(ctx context.Context, msg string, args ...interface{}) {
+	l.Logf(ctx, TraceLevel, msg, args...)
 }
 
-func (l *defaultLogger) Fatalf(msg string, args ...interface{}) {
-	l.logf(FatalLevel, msg, args...)
+func (l *defaultLogger) Fatalf(ctx context.Context, msg string, args ...interface{}) {
+	l.Logf(ctx, FatalLevel, msg, args...)
 	os.Exit(1)
 }
 
-func (l *defaultLogger) log(level Level, args ...interface{}) {
+func (l *defaultLogger) Log(ctx context.Context, level Level, args ...interface{}) {
 	if !l.V(level) {
 		return
 	}
@@ -157,7 +160,7 @@ func (l *defaultLogger) log(level Level, args ...interface{}) {
 	l.RUnlock()
 }
 
-func (l *defaultLogger) logf(level Level, msg string, args ...interface{}) {
+func (l *defaultLogger) Logf(ctx context.Context, level Level, msg string, args ...interface{}) {
 	if !l.V(level) {
 		return
 	}

logger/options.go

@@ -6,9 +6,12 @@ import (
 	"os"
 )
 
+// Option func
 type Option func(*Options)
 
+// Options holds logger options
 type Options struct {
+	Name string
 	// The logging level the logger should log at. default is `InfoLevel`
 	Level Level
 	// fields to always be logged
@@ -21,12 +24,13 @@ type Options struct {
 	Context context.Context
 }
 
+// NewOptions creates new options struct
 func NewOptions(opts ...Option) Options {
 	options := Options{
-		Level:           InfoLevel,
+		Level:           DefaultLevel,
 		Fields:          make(map[string]interface{}),
 		Out:             os.Stderr,
-		CallerSkipCount: 2,
+		CallerSkipCount: 0,
 		Context:         context.Background(),
 	}
 	for _, o := range opts {
@@ -37,37 +41,42 @@ func NewOptions(opts ...Option) Options {
 
 // WithFields set default fields for the logger
 func WithFields(fields map[string]interface{}) Option {
-	return func(args *Options) {
-		args.Fields = fields
+	return func(o *Options) {
+		o.Fields = fields
 	}
 }
 
 // WithLevel set default level for the logger
 func WithLevel(level Level) Option {
-	return func(args *Options) {
-		args.Level = level
+	return func(o *Options) {
+		o.Level = level
 	}
 }
 
 // WithOutput set default output writer for the logger
 func WithOutput(out io.Writer) Option {
-	return func(args *Options) {
-		args.Out = out
+	return func(o *Options) {
+		o.Out = out
 	}
 }
 
 // WithCallerSkipCount set frame count to skip
 func WithCallerSkipCount(c int) Option {
-	return func(args *Options) {
-		args.CallerSkipCount = c
+	return func(o *Options) {
+		o.CallerSkipCount = c
 	}
 }
 
-func SetOption(k, v interface{}) Option {
+// WithContext set context
+func WithContext(ctx context.Context) Option {
 	return func(o *Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
+		o.Context = ctx
+	}
+}
+
+// WithName sets the name
+func withName(n string) Option {
+	return func(o *Options) {
+		o.Name = n
 	}
 }

metadata/context.go

@@ -0,0 +1,39 @@
+// Package metadata is a way of defining message headers
+package metadata
+
+import (
+	"context"
+)
+
+// FromContext returns metadata from the given context
+func FromContext(ctx context.Context) (Metadata, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	md, ok := ctx.Value(metadataKey{}).(Metadata)
+	if !ok {
+		return nil, ok
+	}
+	nmd := Copy(md)
+	return nmd, ok
+}
+
+// NewContext creates a new context with the given metadata
+func NewContext(ctx context.Context, md Metadata) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, metadataKey{}, Copy(md))
+}
+
+// MergeContext merges metadata to existing metadata, overwriting if specified
+func MergeContext(ctx context.Context, pmd Metadata, overwrite bool) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	md, ok := FromContext(ctx)
+	if !ok {
+		return context.WithValue(ctx, metadataKey{}, Copy(pmd))
+	}
+	return context.WithValue(ctx, metadataKey{}, Merge(md, pmd, overwrite))
+}

metadata/metadata.go

@@ -4,6 +4,12 @@ package metadata
 import (
 	"context"
 	"net/textproto"
+	"sort"
+)
+
+var (
+	// HeaderPrefix for all headers passed
+	HeaderPrefix = "Micro-"
 )
 
 type metadataKey struct{}
@@ -18,6 +24,35 @@ var (
 	DefaultMetadataSize = 6
 )
 
+type Iterator struct {
+	cur  int
+	cnt  int
+	keys []string
+	md   Metadata
+}
+
+func (iter *Iterator) Next(k, v *string) bool {
+	if iter.cur+1 > iter.cnt {
+		return false
+	}
+
+	*k = iter.keys[iter.cur]
+	*v = iter.md[*k]
+	iter.cur++
+	return true
+}
+
+// Iterate returns run user func with map key, val sorted by key
+func (md Metadata) Iterator() *Iterator {
+	iter := &Iterator{md: md, cnt: len(md)}
+	iter.keys = make([]string, 0, iter.cnt)
+	for k := range md {
+		iter.keys = append(iter.keys, k)
+	}
+	sort.Strings(iter.keys)
+	return iter
+}
+
 // Get returns value from metadata by key
 func (md Metadata) Get(key string) (string, bool) {
 	// fast path
@@ -54,6 +89,7 @@ func Copy(md Metadata) Metadata {
 	return nmd
 }
 
+// Del deletes key from metadata
 func Del(ctx context.Context, key string) context.Context {
 	md, ok := FromContext(ctx)
 	if !ok {
@@ -82,19 +118,6 @@ func Get(ctx context.Context, key string) (string, bool) {
 	return md.Get(key)
 }
 
-// FromContext returns metadata from the given context
-func FromContext(ctx context.Context) (Metadata, bool) {
-	if ctx == nil {
-		return nil, false
-	}
-	md, ok := ctx.Value(metadataKey{}).(Metadata)
-	if !ok {
-		return nil, ok
-	}
-	nmd := Copy(md)
-	return nmd, ok
-}
-
 // New return new sized metadata
 func New(size int) Metadata {
 	if size == 0 {
@@ -103,25 +126,10 @@ func New(size int) Metadata {
 	return make(Metadata, size)
 }
 
-// NewContext creates a new context with the given metadata
-func NewContext(ctx context.Context, md Metadata) context.Context {
-	if ctx == nil {
-		ctx = context.Background()
-	}
-	return context.WithValue(ctx, metadataKey{}, Copy(md))
-}
-
-// MergeContext merges metadata to existing metadata, overwriting if specified
-func MergeContext(ctx context.Context, pmd Metadata, overwrite bool) context.Context {
-	if ctx == nil {
-		ctx = context.Background()
-	}
-	md, ok := FromContext(ctx)
-	if !ok {
-		return context.WithValue(ctx, metadataKey{}, Copy(pmd))
-	}
-	nmd := Copy(md)
-	for key, val := range pmd {
+// Merge merges metadata to existing metadata, overwriting if specified
+func Merge(omd Metadata, mmd Metadata, overwrite bool) Metadata {
+	nmd := Copy(omd)
+	for key, val := range mmd {
 		if _, ok := nmd[key]; ok && !overwrite {
 			// skip
 		} else if val != "" {
@@ -130,5 +138,5 @@ func MergeContext(ctx context.Context, pmd Metadata, overwrite bool) context.Con
 			nmd.Del(key)
 		}
 	}
-	return context.WithValue(ctx, metadataKey{}, nmd)
+	return nmd
 }

metadata/metadata_test.go

@@ -2,10 +2,40 @@ package metadata
 
 import (
 	"context"
+	"fmt"
 	"reflect"
 	"testing"
 )
 
+func TestMerge(t *testing.T) {
+	omd := Metadata{
+		"key1": "val1",
+	}
+	mmd := Metadata{
+		"key2": "val2",
+	}
+
+	nmd := Merge(omd, mmd, true)
+	if len(nmd) != 2 {
+		t.Fatalf("merge failed: %v", nmd)
+	}
+}
+
+func TestIterator(t *testing.T) {
+	md := Metadata{
+		"1Last":   "last",
+		"2First":  "first",
+		"3Second": "second",
+	}
+
+	iter := md.Iterator()
+	var k, v string
+
+	for iter.Next(&k, &v) {
+		fmt.Printf("k: %s, v: %s\n", k, v)
+	}
+}
+
 func TestMedataCanonicalKey(t *testing.T) {
 	ctx := Set(context.TODO(), "x-request-id", "12345")
 	v, ok := Get(ctx, "x-request-id")

meter/context.go

@@ -0,0 +1,34 @@
+package meter
+
+import (
+	"context"
+)
+
+type meterKey struct{}
+
+// FromContext get meter from context
+func FromContext(ctx context.Context) (Meter, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	c, ok := ctx.Value(meterKey{}).(Meter)
+	return c, ok
+}
+
+// NewContext put meter in context
+func NewContext(ctx context.Context, c Meter) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, meterKey{}, c)
+}
+
+// SetOption returns a function to setup a context with given value
+func SetOption(k, v interface{}) Option {
+	return func(o *Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

meter/meter.go

@@ -0,0 +1,127 @@
+// Package meter is for instrumentation
+package meter
+
+import (
+	"io"
+	"sort"
+	"time"
+)
+
+var (
+	// DefaultMeter is the default meter
+	DefaultMeter Meter = NewMeter()
+	// DefaultAddress data will be made available on this host:port
+	DefaultAddress = ":9090"
+	// DefaultPath the meter endpoint where the Meter data will be made available
+	DefaultPath = "/metrics"
+	// timingObjectives is the default spread of stats we maintain for timings / histograms:
+	//defaultTimingObjectives = map[float64]float64{0.0: 0, 0.5: 0.05, 0.75: 0.04, 0.90: 0.03, 0.95: 0.02, 0.98: 0.001, 1: 0}
+	// default metric prefix
+	DefaultMetricPrefix = "micro_"
+	// default label prefix
+	DefaultLabelPrefix = "micro_"
+)
+
+// Meter is an interface for collecting and instrumenting metrics
+type Meter interface {
+	Name() string
+	Init(...Option) error
+	Counter(string, ...Option) Counter
+	FloatCounter(string, ...Option) FloatCounter
+	Gauge(string, func() float64, ...Option) Gauge
+	Set(...Option) Meter
+	Histogram(string, ...Option) Histogram
+	Summary(string, ...Option) Summary
+	SummaryExt(string, time.Duration, []float64, ...Option) Summary
+	Write(io.Writer, bool) error
+	Options() Options
+	String() string
+}
+
+// Counter is a counter
+type Counter interface {
+	Add(int)
+	Dec()
+	Get() uint64
+	Inc()
+	Set(uint64)
+}
+
+// FloatCounter is a float64 counter
+type FloatCounter interface {
+	Add(float64)
+	Get() float64
+	Set(float64)
+	Sub(float64)
+}
+
+// Gauge is a float64 gauge
+type Gauge interface {
+	Get() float64
+}
+
+// Histogram is a histogram for non-negative values with automatically created buckets
+type Histogram interface {
+	Reset()
+	Update(float64)
+	UpdateDuration(time.Time)
+	// VisitNonZeroBuckets(f func(vmrange string, count uint64))
+}
+
+// Summary is the summary
+type Summary interface {
+	Update(float64)
+	UpdateDuration(time.Time)
+}
+
+type Labels struct {
+	keys []string
+	vals []string
+}
+
+func (ls Labels) Len() int {
+	return len(ls.keys)
+}
+
+func (ls Labels) Swap(i, j int) {
+	ls.keys[i], ls.keys[j] = ls.keys[j], ls.keys[i]
+	ls.vals[i], ls.vals[j] = ls.vals[j], ls.vals[i]
+}
+
+func (ls Labels) Less(i, j int) bool {
+	return ls.vals[i] < ls.vals[j]
+}
+
+func (ls Labels) Sort() {
+	sort.Sort(ls)
+}
+
+func (ls Labels) Append(nls Labels) Labels {
+	for n := range nls.keys {
+		ls.keys = append(ls.keys, nls.keys[n])
+		ls.vals = append(ls.vals, nls.vals[n])
+	}
+	return ls
+}
+
+type LabelIter struct {
+	labels Labels
+	cnt    int
+	cur    int
+}
+
+func (ls Labels) Iter() *LabelIter {
+	ls.Sort()
+	return &LabelIter{labels: ls, cnt: len(ls.keys)}
+}
+
+func (iter *LabelIter) Next(k, v *string) bool {
+	if iter.cur+1 > iter.cnt {
+		return false
+	}
+
+	*k = iter.labels.keys[iter.cur]
+	*v = iter.labels.vals[iter.cur]
+	iter.cur++
+	return true
+}

meter/meter_test.go

@@ -0,0 +1,63 @@
+package meter
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNoopMeter(t *testing.T) {
+	meter := NewMeter(Path("/noop"))
+	assert.NotNil(t, meter)
+	assert.Equal(t, "/noop", meter.Options().Path)
+	assert.Implements(t, new(Meter), meter)
+
+	cnt := meter.Counter("counter", Label("server", "noop"))
+	cnt.Inc()
+
+}
+
+func TestLabels(t *testing.T) {
+	var ls Labels
+	ls.keys = []string{"type", "server"}
+	ls.vals = []string{"noop", "http"}
+
+	ls.Sort()
+
+	if ls.keys[0] != "server" || ls.vals[0] != "http" {
+		t.Fatalf("sort error: %v", ls)
+	}
+}
+
+func TestLabelsAppend(t *testing.T) {
+	var ls Labels
+	ls.keys = []string{"type", "server"}
+	ls.vals = []string{"noop", "http"}
+
+	var nls Labels
+	nls.keys = []string{"register"}
+	nls.vals = []string{"gossip"}
+	ls = ls.Append(nls)
+
+	ls.Sort()
+
+	if ls.keys[0] != "register" || ls.vals[0] != "gossip" {
+		t.Fatalf("append error: %v", ls)
+	}
+}
+
+func TestIterator(t *testing.T) {
+	var ls Labels
+	ls.keys = []string{"type", "server", "register"}
+	ls.vals = []string{"noop", "http", "gossip"}
+
+	iter := ls.Iter()
+	var k, v string
+	cnt := 0
+	for iter.Next(&k, &v) {
+		if cnt == 1 && (k != "server" || v != "http") {
+			t.Fatalf("iter error: %s != %s || %s != %s", k, "server", v, "http")
+		}
+		cnt++
+	}
+}

meter/noop.go

@@ -0,0 +1,162 @@
+package meter
+
+import (
+	"io"
+	"time"
+)
+
+// NoopMeter is an noop implementation of Meter
+type noopMeter struct {
+	opts   Options
+	labels Labels
+}
+
+// NewMeter returns a configured noop reporter:
+func NewMeter(opts ...Option) Meter {
+	return &noopMeter{opts: NewOptions(opts...)}
+}
+
+func (r *noopMeter) Name() string {
+	return r.opts.Name
+}
+
+// Init initialize options
+func (r *noopMeter) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&r.opts)
+	}
+	return nil
+}
+
+// Counter implements the Meter interface
+func (r *noopMeter) Counter(name string, opts ...Option) Counter {
+	options := Options{}
+	for _, o := range opts {
+		o(&options)
+	}
+	return &noopCounter{labels: options.Labels}
+}
+
+// FloatCounter implements the Meter interface
+func (r *noopMeter) FloatCounter(name string, opts ...Option) FloatCounter {
+	return &noopFloatCounter{}
+}
+
+// Gauge implements the Meter interface
+func (r *noopMeter) Gauge(name string, f func() float64, opts ...Option) Gauge {
+	return &noopGauge{}
+}
+
+// Summary implements the Meter interface
+func (r *noopMeter) Summary(name string, opts ...Option) Summary {
+	return &noopSummary{}
+}
+
+// SummaryExt implements the Meter interface
+func (r *noopMeter) SummaryExt(name string, window time.Duration, quantiles []float64, opts ...Option) Summary {
+	return &noopSummary{}
+}
+
+// Histogram implements the Meter interface
+func (r *noopMeter) Histogram(name string, opts ...Option) Histogram {
+	return &noopHistogram{}
+}
+
+// Set implements the Meter interface
+func (r *noopMeter) Set(opts ...Option) Meter {
+	m := &noopMeter{opts: r.opts}
+
+	for _, o := range opts {
+		o(&m.opts)
+	}
+
+	return m
+}
+
+func (r *noopMeter) Write(w io.Writer, withProcessMetrics bool) error {
+	return nil
+}
+
+// Options implements the Meter interface
+func (r *noopMeter) Options() Options {
+	return r.opts
+}
+
+// String implements the Meter interface
+func (r *noopMeter) String() string {
+	return "noop"
+}
+
+type noopCounter struct {
+	labels Labels
+}
+
+func (r *noopCounter) Add(int) {
+
+}
+
+func (r *noopCounter) Dec() {
+
+}
+
+func (r *noopCounter) Get() uint64 {
+	return 0
+}
+
+func (r *noopCounter) Inc() {
+
+}
+
+func (r *noopCounter) Set(uint64) {
+
+}
+
+type noopFloatCounter struct{}
+
+func (r *noopFloatCounter) Add(float64) {
+
+}
+
+func (r *noopFloatCounter) Get() float64 {
+	return 0
+}
+
+func (r *noopFloatCounter) Set(float64) {
+
+}
+
+func (r *noopFloatCounter) Sub(float64) {
+
+}
+
+type noopGauge struct{}
+
+func (r *noopGauge) Get() float64 {
+	return 0
+}
+
+type noopSummary struct{}
+
+func (r *noopSummary) Update(float64) {
+
+}
+
+func (r *noopSummary) UpdateDuration(time.Time) {
+
+}
+
+type noopHistogram struct{}
+
+func (r *noopHistogram) Reset() {
+
+}
+
+func (r *noopHistogram) Update(float64) {
+
+}
+
+func (r *noopHistogram) UpdateDuration(time.Time) {
+
+}
+
+//func (r *noopHistogram) VisitNonZeroBuckets(f func(vmrange string, count uint64)) {}

meter/options.go

@@ -0,0 +1,102 @@
+package meter
+
+import (
+	"context"
+
+	"github.com/unistack-org/micro/v3/logger"
+)
+
+// Option powers the configuration for metrics implementations:
+type Option func(*Options)
+
+// Options for metrics implementations:
+type Options struct {
+	Name    string
+	Address string
+	Path    string
+	Labels  Labels
+	//TimingObjectives map[float64]float64
+	Logger       logger.Logger
+	Context      context.Context
+	MetricPrefix string
+	LabelPrefix  string
+}
+
+// NewOptions prepares a set of options:
+func NewOptions(opt ...Option) Options {
+	opts := Options{
+		Address:      DefaultAddress,
+		Path:         DefaultPath,
+		Context:      context.Background(),
+		Logger:       logger.DefaultLogger,
+		MetricPrefix: DefaultMetricPrefix,
+		LabelPrefix:  DefaultLabelPrefix,
+	}
+
+	for _, o := range opt {
+		o(&opts)
+	}
+
+	return opts
+}
+
+// Context sets the metrics context
+func Context(ctx context.Context) Option {
+	return func(o *Options) {
+		o.Context = ctx
+	}
+}
+
+// Path used to serve metrics over HTTP
+func Path(value string) Option {
+	return func(o *Options) {
+		o.Path = value
+	}
+}
+
+// Address is the listen address to serve metrics
+func Address(value string) Option {
+	return func(o *Options) {
+		o.Address = value
+	}
+}
+
+/*
+// Labels be added to every metric
+func Labels(labels []string) Option {
+	return func(o *Options) {
+		o.Labels = labels
+	}
+}
+*/
+
+/*
+// TimingObjectives defines the desired spread of statistics for histogram / timing metrics:
+func TimingObjectives(value map[float64]float64) Option {
+	return func(o *Options) {
+		o.TimingObjectives = value
+	}
+}
+*/
+
+// Logger sets the logger
+func Logger(l logger.Logger) Option {
+	return func(o *Options) {
+		o.Logger = l
+	}
+}
+
+// Label sets the label
+func Label(key, val string) Option {
+	return func(o *Options) {
+		o.Labels.keys = append(o.Labels.keys, key)
+		o.Labels.vals = append(o.Labels.vals, val)
+	}
+}
+
+// Name sets the name
+func Name(n string) Option {
+	return func(o *Options) {
+		o.Name = n
+	}
+}

meter/wrapper/wrapper.go

@@ -0,0 +1,232 @@
+// +build ignore
+
+package wrapper
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/unistack-org/micro/v3/client"
+	"github.com/unistack-org/micro/v3/meter"
+	"github.com/unistack-org/micro/v3/server"
+)
+
+type Options struct {
+	Meter   meter.Meter
+	Name    string
+	Version string
+	ID      string
+}
+
+type Option func(*Options)
+
+func ServiceName(name string) Option {
+	return func(o *Options) {
+		o.Name = name
+	}
+}
+
+func ServiceVersion(version string) Option {
+	return func(o *Options) {
+		o.Version = version
+	}
+}
+
+func ServiceID(id string) Option {
+	return func(o *Options) {
+		o.ID = id
+	}
+}
+
+func Meter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+type wrapper struct {
+	options  Options
+	callFunc client.CallFunc
+	client.Client
+}
+
+func NewClientWrapper(opts ...Option) client.Wrapper {
+	return func(c client.Client) client.Client {
+		handler := &wrapper{
+			labels: labels,
+			Client: c,
+		}
+
+		return handler
+	}
+}
+
+func NewCallWrapper(opts ...Option) client.CallWrapper {
+	labels := getLabels(opts...)
+
+	return func(fn client.CallFunc) client.CallFunc {
+		handler := &wrapper{
+			labels:   labels,
+			callFunc: fn,
+		}
+
+		return handler.CallFunc
+	}
+}
+
+func (w *wrapper) CallFunc(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions) error {
+	endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
+	wlabels := append(w.labels, fmt.Sprintf(`%sendpoint="%s"`, DefaultLabelPrefix, endpoint))
+
+	timeCounterSummary := metrics.GetOrCreateSummary(getName("client_request_latency_microseconds", wlabels))
+	timeCounterHistogram := metrics.GetOrCreateSummary(getName("client_request_duration_seconds", wlabels))
+
+	ts := time.Now()
+	err := w.callFunc(ctx, addr, req, rsp, opts)
+	te := time.Since(ts)
+
+	timeCounterSummary.Update(float64(te.Seconds()))
+	timeCounterHistogram.Update(te.Seconds())
+	if err == nil {
+		metrics.GetOrCreateCounter(getName("client_request_total", append(wlabels, fmt.Sprintf(`%sstatus="success"`, DefaultLabelPrefix)))).Inc()
+	} else {
+		metrics.GetOrCreateCounter(getName("client_request_total", append(wlabels, fmt.Sprintf(`%sstatus="failure"`, DefaultLabelPrefix)))).Inc()
+	}
+
+	return err
+}
+
+func (w *wrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
+	endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
+	wlabels := append(w.labels, fmt.Sprintf(`%sendpoint="%s"`, DefaultLabelPrefix, endpoint))
+
+	timeCounterSummary := metrics.GetOrCreateSummary(getName("client_request_latency_microseconds", wlabels))
+	timeCounterHistogram := metrics.GetOrCreateSummary(getName("client_request_duration_seconds", wlabels))
+
+	ts := time.Now()
+	err := w.Client.Call(ctx, req, rsp, opts...)
+	te := time.Since(ts)
+
+	timeCounterSummary.Update(float64(te.Seconds()))
+	timeCounterHistogram.Update(te.Seconds())
+	if err == nil {
+		metrics.GetOrCreateCounter(getName("client_request_total", append(wlabels, fmt.Sprintf(`%sstatus="success"`, DefaultLabelPrefix)))).Inc()
+	} else {
+		metrics.GetOrCreateCounter(getName("client_request_total", append(wlabels, fmt.Sprintf(`%sstatus="failure"`, DefaultLabelPrefix)))).Inc()
+	}
+
+	return err
+}
+
+func (w *wrapper) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
+	endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
+	wlabels := append(w.labels, fmt.Sprintf(`%sendpoint="%s"`, DefaultLabelPrefix, endpoint))
+
+	timeCounterSummary := metrics.GetOrCreateSummary(getName("client_request_latency_microseconds", wlabels))
+	timeCounterHistogram := metrics.GetOrCreateSummary(getName("client_request_duration_seconds", wlabels))
+
+	ts := time.Now()
+	stream, err := w.Client.Stream(ctx, req, opts...)
+	te := time.Since(ts)
+
+	timeCounterSummary.Update(float64(te.Seconds()))
+	timeCounterHistogram.Update(te.Seconds())
+	if err == nil {
+		metrics.GetOrCreateCounter(getName("client_request_total", append(wlabels, fmt.Sprintf(`%sstatus="success"`, DefaultLabelPrefix)))).Inc()
+	} else {
+		metrics.GetOrCreateCounter(getName("client_request_total", append(wlabels, fmt.Sprintf(`%sstatus="failure"`, DefaultLabelPrefix)))).Inc()
+	}
+
+	return stream, err
+}
+
+func (w *wrapper) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
+	endpoint := p.Topic()
+	wlabels := append(w.labels, fmt.Sprintf(`%sendpoint="%s"`, DefaultLabelPrefix, endpoint))
+
+	timeCounterSummary := metrics.GetOrCreateSummary(getName("publish_message_latency_microseconds", wlabels))
+	timeCounterHistogram := metrics.GetOrCreateSummary(getName("publish_message_duration_seconds", wlabels))
+
+	ts := time.Now()
+	err := w.Client.Publish(ctx, p, opts...)
+	te := time.Since(ts)
+
+	timeCounterSummary.Update(float64(te.Seconds()))
+	timeCounterHistogram.Update(te.Seconds())
+	if err == nil {
+		metrics.GetOrCreateCounter(getName("publish_message_total", append(wlabels, fmt.Sprintf(`%sstatus="success"`, DefaultLabelPrefix)))).Inc()
+	} else {
+		metrics.GetOrCreateCounter(getName("publish_message_total", append(wlabels, fmt.Sprintf(`%sstatus="failure"`, DefaultLabelPrefix)))).Inc()
+	}
+
+	return err
+}
+
+func NewHandlerWrapper(opts ...Option) server.HandlerWrapper {
+	labels := getLabels(opts...)
+
+	handler := &wrapper{
+		labels: labels,
+	}
+
+	return handler.HandlerFunc
+}
+
+func (w *wrapper) HandlerFunc(fn server.HandlerFunc) server.HandlerFunc {
+	return func(ctx context.Context, req server.Request, rsp interface{}) error {
+		endpoint := req.Endpoint()
+		wlabels := append(w.labels, fmt.Sprintf(`%sendpoint="%s"`, DefaultLabelPrefix, endpoint))
+
+		timeCounterSummary := metrics.GetOrCreateSummary(getName("server_request_latency_microseconds", wlabels))
+		timeCounterHistogram := metrics.GetOrCreateSummary(getName("server_request_duration_seconds", wlabels))
+
+		ts := time.Now()
+		err := fn(ctx, req, rsp)
+		te := time.Since(ts)
+
+		timeCounterSummary.Update(float64(te.Seconds()))
+		timeCounterHistogram.Update(te.Seconds())
+		if err == nil {
+			metrics.GetOrCreateCounter(getName("server_request_total", append(wlabels, fmt.Sprintf(`%sstatus="success"`, DefaultLabelPrefix)))).Inc()
+		} else {
+			metrics.GetOrCreateCounter(getName("server_request_total", append(wlabels, fmt.Sprintf(`%sstatus="failure"`, DefaultLabelPrefix)))).Inc()
+		}
+
+		return err
+	}
+}
+
+func NewSubscriberWrapper(opts ...Option) server.SubscriberWrapper {
+	labels := getLabels(opts...)
+
+	handler := &wrapper{
+		labels: labels,
+	}
+
+	return handler.SubscriberFunc
+}
+
+func (w *wrapper) SubscriberFunc(fn server.SubscriberFunc) server.SubscriberFunc {
+	return func(ctx context.Context, msg server.Message) error {
+		endpoint := msg.Topic()
+		wlabels := append(w.labels, fmt.Sprintf(`%sendpoint="%s"`, DefaultLabelPrefix, endpoint))
+
+		timeCounterSummary := metrics.GetOrCreateSummary(getName("subscribe_message_latency_microseconds", wlabels))
+		timeCounterHistogram := metrics.GetOrCreateSummary(getName("subscribe_message_duration_seconds", wlabels))
+
+		ts := time.Now()
+		err := fn(ctx, msg)
+		te := time.Since(ts)
+
+		timeCounterSummary.Update(float64(te.Seconds()))
+		timeCounterHistogram.Update(te.Seconds())
+		if err == nil {
+			metrics.GetOrCreateCounter(getName("subscribe_message_total", append(wlabels, fmt.Sprintf(`%sstatus="success"`, DefaultLabelPrefix)))).Inc()
+		} else {
+			metrics.GetOrCreateCounter(getName("subscribe_message_total", append(wlabels, fmt.Sprintf(`%sstatus="failure"`, DefaultLabelPrefix)))).Inc()
+		}
+
+		return err
+	}
+}

metrics/README.md

@@ -1,22 +0,0 @@
-metrics
-=======
-
-The metrics package provides a simple metrics "Reporter" interface which allows the user to submit counters, gauges and timings (along with key/value tags).
-
-Implementations
----------------
-
-* Prometheus (pull): will be first
-* Prometheus (push): certainly achievable
-* InfluxDB: could quite easily be done
-* Telegraf: almost identical to the InfluxDB implementation
-* Micro: Could we provide metrics over Micro's server interface?
-
-
-Todo
-----
-
-* Include a handler middleware which uses the Reporter interface to generate per-request level metrics
-    - Throughput
-    - Errors
-    - Duration

metrics/noop/reporter.go

@@ -1,37 +0,0 @@
-package noop
-
-import (
-	"time"
-
-	log "github.com/unistack-org/micro/v3/logger"
-	"github.com/unistack-org/micro/v3/metrics"
-)
-
-// Reporter is an implementation of metrics.Reporter:
-type Reporter struct {
-	options metrics.Options
-}
-
-// New returns a configured noop reporter:
-func New(opts ...metrics.Option) *Reporter {
-	log.Info("Metrics/NoOp - not doing anything")
-
-	return &Reporter{
-		options: metrics.NewOptions(opts...),
-	}
-}
-
-// Count implements the metrics.Reporter interface Count method:
-func (r *Reporter) Count(metricName string, value int64, tags metrics.Tags) error {
-	return nil
-}
-
-// Gauge implements the metrics.Reporter interface Gauge method:
-func (r *Reporter) Gauge(metricName string, value float64, tags metrics.Tags) error {
-	return nil
-}
-
-// Timing implements the metrics.Reporter interface Timing method:
-func (r *Reporter) Timing(metricName string, value time.Duration, tags metrics.Tags) error {
-	return nil
-}

metrics/noop/reporter_test.go

@@ -1,20 +0,0 @@
-package noop
-
-import (
-	"testing"
-
-	"github.com/unistack-org/micro/v3/metrics"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestNoopReporter(t *testing.T) {
-
-	// Make a Reporter:
-	reporter := New(metrics.Path("/noop"))
-	assert.NotNil(t, reporter)
-	assert.Equal(t, "/noop", reporter.options.Path)
-
-	// Check that our implementation is valid:
-	assert.Implements(t, new(metrics.Reporter), reporter)
-}

metrics/options.go

@@ -1,75 +0,0 @@
-package metrics
-
-import "github.com/unistack-org/micro/v3/logger"
-
-var (
-	// The Prometheus metrics will be made available on this port:
-	defaultPrometheusListenAddress = ":9000"
-	// This is the endpoint where the Prometheus metrics will be made available ("/metrics" is the default with Prometheus):
-	defaultPath = "/metrics"
-	// timingObjectives is the default spread of stats we maintain for timings / histograms:
-	defaultTimingObjectives = map[float64]float64{0.0: 0, 0.5: 0.05, 0.75: 0.04, 0.90: 0.03, 0.95: 0.02, 0.98: 0.001, 1: 0}
-)
-
-// Option powers the configuration for metrics implementations:
-type Option func(*Options)
-
-// Options for metrics implementations:
-type Options struct {
-	Address          string
-	Path             string
-	DefaultTags      Tags
-	TimingObjectives map[float64]float64
-	Logger           logger.Logger
-}
-
-// NewOptions prepares a set of options:
-func NewOptions(opt ...Option) Options {
-	opts := Options{
-		Address:          defaultPrometheusListenAddress,
-		DefaultTags:      make(Tags),
-		Path:             defaultPath,
-		TimingObjectives: defaultTimingObjectives,
-	}
-
-	for _, o := range opt {
-		o(&opts)
-	}
-
-	return opts
-}
-
-// Path used to serve metrics over HTTP:
-func Path(value string) Option {
-	return func(o *Options) {
-		o.Path = value
-	}
-}
-
-// Address is the listen address to serve metrics on:
-func Address(value string) Option {
-	return func(o *Options) {
-		o.Address = value
-	}
-}
-
-// DefaultTags will be added to every metric:
-func DefaultTags(value Tags) Option {
-	return func(o *Options) {
-		o.DefaultTags = value
-	}
-}
-
-// TimingObjectives defines the desired spread of statistics for histogram / timing metrics:
-func TimingObjectives(value map[float64]float64) Option {
-	return func(o *Options) {
-		o.TimingObjectives = value
-	}
-}
-
-// Logger sets the logger
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}